datasheet for HT82K94E by Holtek Semiconductor

datasheet for HT82K94E by Holtek Semiconductor
HT82K94E/HT82K94A
USB Multimedia Keyboard Encoder 8-Bit MCU
Technical Document
· Tools Information
· FAQs
· Application Note
Features
· Operating voltage:
· 8-level subroutine nesting
fSYS=6MHz: 2.3V~5.5V
fSYS=12MHz: 3.0V~5.5V
· Up to 0.33ms instruction cycle with 12MHz system
clock at VDD=5V
· 40 bidirectional I/O lines (max.)
· Bit manipulation instruction
· 8-bit programmable timer/event counter with
· 16-bit table read instruction
overflow interrupt (shared with PD4, vector 08H)
· 63 powerful instructions
· 16-bit programmable timer/event counter and
· All instructions in one or two machine cycles
overflow interrupts (shared with PA7, vector 0CH)
· Optional 3-battery mode 2.4V LVR/2.6V LVD (±0.1V)
· Crystal oscillator (6MHz or 12MHz)
by option, Low battery detector with internal bit
· Watchdog Timer
· Optional 2-battery mode 2.2V LVR/2.4V LVD (±0.1V)
· PS2 and USB modes supported
by option, Low battery detector with internal bit
· USB 2.0 low speed function
· Operating voltage from 4.0V to 5.5V
· 4 endpoints supported (endpoint 0 included)
(For Connect USB/PS2 Mode)
· 6144´16 program memory ROM
· Operating voltage from 2.2V to 3.3V
(For Pure Cal. Mode)
· 224´8 data memory RAM
· 32-pin QFN, 48-pin SSOP/LQFP packages
· One internal USB interrupt (vector 04H)
· All I/O ports support wake-up options
· HALT function and wake-up feature reduce power
consumption
General Description
This device is an 8-bit high performance RISC architecture microcontroller designed for USB product applications. It is particularly suitable for use in products such
as keyboards and keyboard with calculator. A HALT feature is included to reduce power consumption.
Rev. 2.30
The mask version HT82K94A is fully pin and functionally compatible with the OTP version HT82K94E device.
1
May 18, 2012
HT82K94E/HT82K94A
Block Diagram
U S B D + /C L K
U S B D -/D A T A
V 3 3 O
T M R 1 C
U S B 1 .1
P S 2
fS
M
Y S
/4
U
X
T M R 1
P A 7 /T M R 1
B P
In te rru p t
C ir c u it
M
P ro g ra m
C o u n te r
/4
Y S
P D 4 /T M R 0
X
S T A C K
P ro g ra m
R O M
fS
U
T M R 0
T M R 0 C
IN T C
E N /D IS
W D T S
In s tr u c tio n
R e g is te r
M
W D T P r e s c a le r
M
M P
S Y S C L K /4
U
X
D A T A
M e m o ry
U
W D T
W D T O S C
X
P A C
P O R T A
P A
M U X
In s tr u c tio n
D e c o d e r
P B C
P O R T B
P A 0 ~ P A 6
P A 7 /T M R 1
P B 0 ~ P B 7
P B
A L U
T im in g
G e n e ra to r
S T A T U S
P C C
S h ifte r
P O R T C
P D C
P O R T D
P D
O S C 2
Rev. 2.30
O S
R
V
V
C 1
E S
D D
S S
P C 0 ~ P C 7
P C
P D 0 ~ P D 3
P D 4 /T M R 0
P D 5 ~ P D 7
A C C
P E C
P O R T E
P E 0 ~ P E 7
P E
2
May 18, 2012
HT82K94E/HT82K94A
Pin Assignment
P A 7 /T M R 1
P A 6
P A 5
P A 4
P A 3
P A 2
P A 1
P A 0
P C 5
1
4 8
P C 6
P C 4
2
4 7
P C 7
P A 3
3
4 6
P A 4
P A 2
4
4 5
P A 5
P A 1
5
4 4
P A 6
P A 0
6
4 3
P A 7 /T M R 1
P C 0
7
4 2
P E 7
P C 1
8
4 1
P E 6
P C 2
9
4 0
P E 5
P C 3
1 0
3 9
P E 4
P E 0
1 1
3 8
P D 3
P E 1
1 2
3 7
P D 2
P E 2
1 3
3 6
P D 1
P E 3
1 4
3 5
P D 0
P D 4 /T M R 0
1 5
3 4
O S C 1
P D 5
1 6
3 3
O S C 2
P D 6
1 7
3 2
R E S
P D 7
1 8
3 1
V S S
3 0
P B 7
2 0
2 9
P B 6
U S B D + /C L K
2 1
2 8
P B 5
U S B D -/D A T A
2 2
2 7
P B 4
P B 0
2 3
2 6
P B 3
P B 1
2 4
2 5
P B 2
2
2 4
3
2 3
H T 8 2 K 9 4 E
H T 8 2 K 9 4 A
3 2 Q F N -A
6
5
4
2 2
2 1
2 0
1 9
1 8
7
1 7
8
P D 3
P D 2
P D 1
P D 0
O S C 1
O S C 2
R E S
V S S
9 1 0 1 1 1 2 1 3 1 4 1 5 1 6
P B 7
P B 6
P B 3
P B 2
P B 1
P B 0
U S B D -/D A T A
U S B D + /C L K
1 9
3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5
1
P D 2
P D 3
P E 4
P E 5
P E 6
P E 7
P A 7
P A 6
P A 5
O A 4
P C 7
P C 6
V D D
V 3 3 O
P C 0
P C 1
P D 4 /T M R 0
P D 5
P D 6
P D 7
V D D
V 3 3 O
P C 5
P C 4
P A 3
P A 2
P A 1
P A 0
P C 0
P C 1
P C 2
P C 3
P E 0
P E 1
H T 8 2 K 9 4 E /H T 8 2 K 9 4 A
4 8 S S O P -A
4 8 4 7 4 6 4 5 4 4 4 3 4 2 4 1 4 0 3 9 3 8 3 7
1
3 6
2
3 5
3
3 4
4
3 3
5
H T 8 2 K 9 4 E
H T 8 2 K 9 4 A
4 8 L Q F P -A
6
7
8
3 2
3 1
3 0
2 9
9
2 8
1 0
2 7
1 1
1 2
2 6
1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4
2 5
P D 1
P D 0
O S C 1
O S C 2
R E S
V S S
P B 7
P B 6
P B 5
P B 4
P B 3
P B 2
P B 1
P B 0
U S B D -/D A T A
U S B D + /C L K
V 3 3 O
V C C
P D 7
P D 6
P D 5
P D 4
P E 3
P E 2
Pin Description
Pin Name
PA0~PA6
PA7/TMR1
PB0~PB7
PC0~PC7
Rev. 2.30
I/O
ROM Code
Option
Description
Bidirectional 8-bit input/output port. Each bit can be configured as a
wake-up input by ROM code option. The input or output mode is conPull-high
trolled by PAC (PA control register).
I/O
Wake-up
Pull-high resistor options: PA0~PA7
CMOS/NMOS/PMOS CMOS/NMOS/PMOS options: PA0~PA7
Wake-up options: PA0~PA7
PA7 is pin-shared with TMR1 input, respectively.
I/O
Pull-high
Wake-up
Bidirectional 8-bit input/output port. Software instructions determine the
CMOS output or Schmitt trigger input with pull-high resistor (determined
by pull-high options).
Wake-up options: PB0~PB7
I/O
Pull-high
Wake-up
Bidirectional I/O lines. Software instructions determine the CMOS output or Schmitt trigger input with pull-high resistor (determined by
pull-high options).
Wake-up options: PC0~PC7
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May 18, 2012
HT82K94E/HT82K94A
I/O
ROM Code
Option
Description
PD0~PD3
PD4/TMR0
PD5~PD7
I/O
Pull-high
Wake-up
Bidirectional I/O lines. Software instructions determine the CMOS output or Schmitt trigger input with pull-high resistor (determined by
pull-high options).
Wake-up options: PD0~PD7
PD4 is pin-shared with TMR0 input.
PE0~PE7
I/O
Pull-high
Wake-up
Bidirectional I/O lines. Software instructions determine the CMOS output or Schmitt trigger input with pull-high resistor (determined by
pull-high options).
Wake-up options: PE0~PE7
VSS
¾
¾
Negative power supply, ground
RES
I
¾
Schmitt trigger reset input. Active low
VDD
¾
¾
Positive power supply
V33O
O
¾
3.3V regulator output
USBD+/CLK
I/O
¾
USBD+ or PS2 CLK I/O line
USB or PS2 function is controlled by software control register
USBD-/DATA
I/O
¾
USBD- or PS2 DATA I/O line
USB or PS2 function is controlled by software control register
OSC1
OSC2
I
O
¾
OSC1, OSC2 are connected to a 6MHz or 12MHz Crystal/resonator
(determined by software instructions) for the internal system clock.
Pin Name
Absolute Maximum Ratings
Supply Voltage ...........................VSS-0.3V to VSS+6.0V
Storage Temperature ............................-50°C to 125°C
Input Voltage..............................VSS-0.3V to VDD+0.3V
Operating Temperature...............................0°C to 70°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed
in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
D.C. Characteristics
Symbol
VDD
Parameter
Ta=25°C
Test Conditions
VDD
Conditions
Min.
Typ.
Max.
Unit
¾
fSYS=6MHz
2.3
¾
5.5
V
¾
fSYS=12MHz
3.0
¾
5.5
V
Operating Voltage
IDD1
Operating Current (6MHz Crystal)
5V
No load, fSYS=6MHz
¾
6.5
12
mA
IDD2
Operating Current (12MHz Crystal)
5V
No load, fSYS=12MHz
¾
7.5
16
mA
ISTB1
Standby Current
5V
No load, system HALT,
USB suspend*
¾
¾
500
mA
ISTB2
Standby Current (WDT Enabled)
5V
No load, system HALT,
input/output mode,
set SUSPEND2 [1EH]
¾
¾
15
mA
VIL1
Input Low Voltage for I/O Ports
5V
TTL level
0
¾
0.8
V
VIH1
Input High Voltage for I/O Ports
5V
TTL level
2
¾
VDD
V
VIL2
Input Low Voltage (RES)
5V
CMOS level
0
¾
0.4VDD
V
VIH2
Input High Voltage (RES)
5V
CMOS level
0.9VDD
¾
VDD
V
Rev. 2.30
4
May 18, 2012
HT82K94E/HT82K94A
Symbol
Parameter
Test Conditions
VDD
Conditions
Min.
Typ.
Max.
Unit
IOL1
I/O Port Sink Current for PA1~PA7,
PB, PC, PD, PE
5V
VOL=3.4V
10
15
20
mA
IOL2
I/O Port Sink Current for PA1~PA7,
PB, PC, PD, PE
5V
VOL=0.4V
2
4
8
mA
IOL3
I/O Port Sink Current for PA0
5V
VOL=0.4V
7
10
13
mA
IOH1
I/O Port Source Current for PA1~PA7,
PB, PC, PD, PE
5V
VOH=3.4V
-2
-4
-8
mA
IOH2
I/O Port Source Current for PA0
5V
VOH=3.4V
-12
-18
-24
mA
RPH
Pull-high Resistance for PA, PB, PC,
PD, PE
5V
25
50
80
kW
VLVR
2-battery option
2.1
2.2
2.3
Low Voltage Reset
¾
3-battery option
2.3
2.4
2.5
VLVD
2-battery option
2.3
2.4
2.5
Low Battery Detecting Voltage
3-battery option
2.5
2.6
2.7
VV33O
3.3V Regulator Output
IV33O=-5mA
3.0
3.3
3.6
¾
5V
¾
V
V
V
Note: ²*² include 15kW loading of USBD+, USBD- line in host terminal.
A.C. Characteristics
Symbol
Parameter
Ta=25°C
Test Conditions
VDD
Conditions
Min.
Typ.
Max.
Unit
fSYS
System Clock (Crystal OSC)
5V
¾
6
¾
12
MHz
fTIMER
Timer I/P Frequency (TMR)
5V
¾
0
¾
12
MHz
5V
¾
15
31
70
ms
tWDTOSC Watchdog Oscillator
tWDT1
Watchdog Time-out Period (WDT OSC) 5V
Without WDT prescaler
4
8
16
ms
tWDT2
Watchdog Time-out Period
(System Clock)
¾
Without WDT prescaler
¾
1024
¾
tSYS
tRES
External Reset Low Pulse Width
¾
¾
1
¾
¾
ms
Wake-up from HALT
¾
1024
¾
tSYS
tSST
System Start-up Timer Period
Power-up, Watchdog
Time-out from normal
¾
1024
¾
tWDTOSC
1
¾
¾
ms
tINT
Rev. 2.30
Interrupt Pulse Width
¾
¾
¾
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May 18, 2012
HT82K94E/HT82K94A
Functional Description
Execution Flow
incremented by one. The program counter then points to
the memory word containing the next instruction code.
The system clock for the microcontroller is derived from
a crystal (6 or 12MHz). The system clock is internally divided into four non-overlapping clocks. One instruction
cycle consists of four system clock cycles.
When executing a jump instruction, conditional skip execution, loading PCL register, subroutine call or return
from subroutine, initial reset, internal interrupt, USB interrupt or return from interrupts, the PC manipulates the
program transfer by loading the address corresponding
to each instruction.
Instruction fetching and execution are pipelined in such
a way that a fetch takes an instruction cycle while decoding and execution takes the next instruction cycle.
However, the pipelining scheme allows each instruction
to be effectively executed in a cycle. If an instruction
changes the program counter, two cycles are required to
complete the instruction.
The conditional skip is activated by instructions. Once
the condition is met, the next instruction, fetched during
the current instruction execution, is discarded and a
dummy cycle replaces it to get the proper instruction.
Otherwise proceed to the next instruction.
Program Counter - PC
The lower byte of the program counter (PCL) is a readable and writeable register (06H). Moving data into the
PCL performs a short jump. The destination will be
within the current program ROM page.
The program counter (PC) controls the sequence in
which the instructions stored in the program ROM are
executed and its contents specify a full range of program memory.
When a control transfer takes place, an additional
dummy cycle is required.
After accessing a program memory word to fetch an instruction code, the contents of the program counter are
T 1
S y s te m
T 2
T 3
T 4
T 1
T 2
T 3
T 4
T 1
T 2
T 3
T 4
C lo c k
O S C 2 ( R C o n ly )
P C
P C
P C + 1
F e tc h IN S T (P C )
E x e c u te IN S T (P C -1 )
P C + 2
F e tc h IN S T (P C + 1 )
E x e c u te IN S T (P C )
F e tc h IN S T (P C + 2 )
E x e c u te IN S T (P C + 1 )
Execution Flow
Program Counter
Mode
*12
*11
*10
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
Initial Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
USB Interrupt
0
0
0
0
0
0
0
0
0
0
1
0
0
Timer/Event Counter 0 Overflow
0
0
0
0
0
0
0
0
0
1
0
0
0
Timer/Event Counter 1 Overflow
0
0
0
0
0
0
0
0
0
1
1
0
0
Skip
Program Counter+2
Loading PCL
*12
*11
*10
*9
*8
@7
@6
@5
@4
@3
@2
@1
@0
Jump, Call Branch
#12
#11
#10
#9
#8
#7
#6
#5
#4
#3
#2
#1
#0
Return from Subroutine
S12
S11
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
S0
Program Counter
Note: *12~*0: Program counter bits
S12~S0: Stack register bits
#12~#0: Instruction code bits
Rev. 2.30
@[email protected]: PCL bits
6
May 18, 2012
HT82K94E/HT82K94A
· Location 00CH
Program Memory - ROM
This location is reserved for the Timer/Event Counter
1 interrupt service program. If a timer interrupt results
from a Timer/Event Counter 1 overflow, and the interrupt is enabled and the stack is not full, the program
begins execution at location 00CH.
The program memory is used to store the program instructions which are to be executed. It also contains
data, table, and interrupt entries, and is organized into
6144´16 bits, addressed by the program counter and table pointer.
· Table location
Certain locations in the program memory are reserved
for special usage:
Any location in the program memory can be used as
look-up tables. There are three method to read the
ROM data by two table read instructions: ²TABRDC²
and ²TABRDL², transfer the contents of the
lower-order byte to the specified data memory, and
the higher-order byte to TBLH (08H).
The three methods are shown as follows:
· Location 000H
This area is reserved for program initialization. After
chip reset, the program always begins execution at location 000H.
· Location 004H
This area is reserved for the USB and external interrupt service program. If the USB interrupt is activated,
the interrupt is enabled and the stack is not full, the
program begins execution at location 004H.
· Location 008H
This area is reserved for the Timer/Event Counter 0 interrupt service program. If a timer interrupt results
from a Timer/Event Counter 0 overflow, and if the interrupt is enabled and the stack is not full, the program
begins execution at location 008H.
D e v ic e In itia liz a tio n P r o g r a m
0 0 4 H
U S B In te r r u p t S u b r o u tin e
T im e r /E v e n t C o u n te r 0
In te r r u p t S u b r o u tin e
0 0 C H
T im e r /E v e n t C o u n te r 1
In te r r u p t S u b r o u tin e
P ro g ra m
M e m o ry
n 0 0 H
L o o k - u p T a b le ( 2 5 6 w o r d s )
n F F H
1 7 0 0 H
L o o k - u p T a b le ( 2 5 6 w o r d s )
1 7 F F H
1 6 b its
N o te : n ra n g e s fro m
0 to F
Program Memory
Instruction
The instructions ²TABRDC [m]² (the current page,
one page=256words), where the table locations is
defined by TBLP (07H) in the current page. And the
ROM code option TBHP is disabled (default).
¨
The instructions ²TABRDC [m]², where the table locations is defined by registers TBLP (07H) and
TBHP (01FH). And the ROM code option TBHP is
enabled.
¨
The instructions ²TABRDL [m]², where the table locations is defined by Registers TBLP (07H) in the
last page (1700H~17FFH).
Only the destination of the lower-order byte in the table is well-defined, the other bits of the table word are
transferred to the lower portion of TBLH, and the remaining 1-bit words are read as ²0². The Table
Higher-order byte register (TBLH) is read only. The table pointer (TBLP, TBHP) is a read/write register (07H,
1FH), which indicates the table location. Before accessing the table, the location must be placed in the
TBLP and TBHP (If the OTP option TBHP is disabled,
the value in TBHP has no effect). The TBLH is read
only and cannot be restored. If the main routine and
the ISR (Interrupt Service Routine) both employ the
table read instruction, the contents of the TBLH in the
main routine are likely to be changed by the table read
instruction used in the ISR. Errors can occur. In other
words, using the table read instruction in the main routine and the ISR simultaneously should be avoided.
However, if the table read instruction has to be applied
in both the main routine and the ISR, the interrupt
should be disabled prior to the table read instruction.
0 0 0 H
0 0 8 H
¨
Table Location
*12
*11
*10
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
TABRDC [m]
P12
P11
P10
P9
P8
@7
@6
@5
@4
@3
@2
@1
@0
TABRDL [m]
1
1
1
1
1
@7
@6
@5
@4
@3
@2
@1
@0
Table Location
Note: *12~*0: Table location bits
@[email protected]: Table pointer bits
Rev. 2.30
P12~P8: Current program counter bits when TBHP is disabled
TBHP register bit3~bit0 when TBHP is enabled
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May 18, 2012
HT82K94E/HT82K94A
register, only the Indirect addressing pointer MP1 can
be used and the Bank register BP should be set to ²1².
The mapping of RAM bank 1 is as shown.
It will not be enabled until the TBLH has been backed
up. All table related instructions require two cycles to
complete the operation. These areas may function as
normal program memory depending on the requirements.
Once TBHP is enabled, the instruction ²TABRDC [m]²
reads the ROM data as defined by TBLP and TBHP
value. Otherwise, the ROM code option TBHP is disabled, the instruction ²TABRDC [m]² reads the ROM
data as defined by TBLP and the current program
counter bits.
B a n k 0
0 0 H
In d ir e c t A d d r e s s in g R e g is te r 0
0 1 H
M P 0
0 2 H
In d ir e c t A d d r e s s in g R e g is te r 1
0 3 H
M P 1
0 4 H
B P
0 5 H
A C C
0 6 H
P C L
0 7 H
T B L P
Stack Register - STACK
0 8 H
T B L H
This is a special part of the memory which is used to
save the contents of the program counter only. The
stack is organized into 8 levels and is neither part of the
data nor part of the program space, and is neither readable nor writeable. The activated level is indexed by the
stack pointer (SP) and is neither readable nor writeable.
At a subroutine call or interrupt acknowledge signal, the
contents of the program counter are pushed onto the
stack. At the end of a subroutine or an interrupt routine,
signaled by a return instruction (RET or RETI), the program counter is restored to its previous value from the
stack. After a chip reset, the SP will point to the top of the
stack.
0 9 H
W D T S
0 A H
S T A T U S
0 B H
IN T C
0 C H
If the stack is full and a non-masked interrupt takes
place, the interrupt request flag will be recorded but the
acknowledge signal will be inhibited. When the stack
pointer is decremented (by RET or RETI), the interrupt
will be serviced. This feature prevents stack overflow allowing the programmer to use the structure more easily.
In a similar case, if the stack is full and a ²CALL² is subsequently executed, stack overflow occurs and the first
entry will be lost (only the most recent 8 return addresses are stored).
0 D H
T M R 0
0 E H
T M R 0 C
0 F H
T M R 1 H
1 0 H
T M R 1 L
1 1 H
T M R 1 C
1 2 H
P A
1 3 H
P A C
1 4 H
P B
1 5 H
P B C
1 6 H
P C
1 7 H
P C C
1 8 H
P D
1 9 H
P D C
1 A H
P E
1 B H
P E C
1 C H
U S C
1 D H
U S R
1 E H
S C C
1 F H
2 0 H
T B H P
S p e c ia l P u r p o s e
D a ta M e m o ry
G e n e ra l P u rp o s e
D a ta M e m o ry
(2 2 4 B y te s )
Data Memory - RAM for Bank 0
: U n u s e d
The data memory is designed with 255´8 bits. The
data memory is divided into two functional groups: special function registers and general purpose data memory (224´8). Most are read/write, but some are read
only.
R e a d a s "0 0 "
F F H
Bank 0 RAM Mapping
4 0 H
4 1 H
The general purpose data memory, addressed from
20H to FFH, is used for data and control information
under instruction commands. All of the data memory
areas can handle arithmetic, logic, increment, decrement and rotate operations directly. Except for some
dedicated bits, each bit in the data memory can be set
and reset by ²SET [m].i² and ²CLR [m].i². They are also
indirectly accessible through memory pointer registers
(MP0 or MP1).
P IP E _ C T R L
4 2 H
A W R
4 3 H
S T A L L
4 4 H
P IP E
4 5 H
S IE S
4 6 H
M IS C
4 7 H
E n d p t_ E N
4 8 H
F IF O 0
4 9 H
F IF O 1
4 A H
F IF O 2
4 B H
F IF O 3
4 C H
U n d e fin e d , r e s e r v e d
fo r fu tu r e e x p a n s io n
Data Memory - RAM for Bank 1
F F H
The special function registers used in USB interface are
located in RAM bank 1. In order to access the Bank1
Rev. 2.30
Bank 1 RAM Mapping
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May 18, 2012
HT82K94E/HT82K94A
Indirect Addressing Register
Status Register - STATUS
Location 00H and 02H are indirect addressing registers
that are not physically implemented. Any read/write operation of [00H] ([02H]) will access data memory pointed
to by MP0 (MP1). Reading location 00H (02H) itself indirectly will return the result 00H. Writing indirectly results
in no operation.
This 8-bit register (0AH) contains the zero flag (Z), carry
flag (C), auxiliary carry flag (AC), overflow flag (OV),
power down flag (PDF), and watchdog time-out flag
(TO). It also records the status information and controls
the operation sequence.
With the exception of the TO and PDF flags, bits in
the status register can be altered by instructions like
most other registers. Any data written into the status
register will not change the TO or PDF flag. In addition operations related to the status register may give
different results from those intended.
The indirect addressing pointer (MP0) always point to
Bank0 RAM addresses regardless of the value of the
Bank Register (BP).
The indirect addressing pointer (MP1) can access
Bank0 or Bank1 RAM data according to the value of BP
which is set to ²0² or ²1² respectively.
The TO flag can be affected only by system power-up, a
WDT time-out or executing the ²CLR WDT² or ²HALT²
instruction. The PDF flag can be affected only by executing the ²HALT² or ²CLR WDT² instruction or during a system power-up.
The memory pointer registers (MP0 and MP1) are 8-bit
registers.
Accumulator
The accumulator is closely related to ALU operations. It
is also mapped to location 05H of the data memory and
can carry out immediate data operations. The data
movement between two data memory locations must
pass through the accumulator.
The Z, OV, AC and C flags generally reflect the status of
the latest operations.
In addition, on entering the interrupt sequence or executing the subroutine call, the status register will not be
pushed onto the stack automatically. If the contents of
the status are important and if the subroutine can corrupt the status register, precautions must be taken to
save it properly.
Arithmetic and Logic Unit - ALU
This circuit performs 8-bit arithmetic and logic operations. The ALU provides the following functions:
· Arithmetic operations (ADD, ADC, SUB, SBC, DAA)
Interrupt
· Logic operations (AND, OR, XOR, CPL)
The device provides internal timer/event counter and
USB interrupts. The Interrupt Control Register
(INTC;0BH) contains the interrupt control bits to set the
enable/disable and the interrupt request flags.
· Rotation (RL, RR, RLC, RRC)
· Increment and Decrement (INC, DEC)
· Branch decision (SZ, SNZ, SIZ, SDZ)
Once an interrupt subroutine is serviced, all the other interrupts will be blocked (by clearing the EMI bit). This
scheme may prevent any further interrupt nesting. Other
interrupt requests may occur during this interval but only
The ALU not only saves the results of a data operation
but also changes the status register.
Bit No.
Label
Function
0
C
C is set if an operation results in a carry during an addition operation or if a borrow does not
take place during a subtraction operation; otherwise C is cleared. C is also affected by a rotate
through carry instruction.
1
AC
AC is set if an operation results in a carry out of the low nibbles in addition or no borrow from
the high nibble into the low nibble in subtraction; otherwise AC is cleared.
2
Z
Z is set if the result of an arithmetic or logic operation is zero; otherwise Z is cleared.
3
OV
OV is set if the operation results in a carry into the highest-order bit but not a carry out of the
highest-order bit, or vice versa; otherwise OV is cleared.
4
PDF
PDF is cleared by system power-up or executing the ²CLR WDT² instruction. PDF is set by
executing the ²HALT² instruction.
5
TO
TO is cleared by system power-up or executing the ²CLR WDT² or ²HALT² instruction. TO is
set by a WDT time-out.
6~7
¾
Unused bit, read as ²0²
Status (0AH) Register
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HT82K94E/HT82K94A
the interrupt request flag is recorded. If a certain interrupt requires servicing within the service routine, the
EMI bit and the corresponding bit of the INTC may be set
to allow interrupt nesting. If the stack is full, the interrupt
request will not be acknowledged, even if the related interrupt is enabled, until the SP is decremented. If immediate service is desired, the stack must be prevented from
becoming full.
been served, the corresponding bit should be cleared by
firmware. When the HT82K94E/HT82K94A receives a
USB Suspend signal from the Host PC, the suspend line
(bit0 of the USC) of the HT82K94E/HT82K94A is set
and a USB interrupt is also triggered.
Also when the HT82K94E/HT82K94A receives a Resume signal from the Host PC, the resume line (bit3 of
the USC) of HT82K94E/HT82K94A is set and a USB interrupt is triggered.
All these kinds of interrupts have a wake-up capability.
As an interrupt is serviced, a control transfer occurs by
pushing the program counter onto the stack, followed by
a branch to a subroutine at specified location in the program memory. Only the program counter is pushed onto
the stack. If the contents of the register or status register
(STATUS) are altered by the interrupt service program
which corrupts the desired control sequence, the contents should be saved in advance.
Whenever a USB reset signal is detected, the USB interrupt is triggered.
The internal Timer/Event Counter 0 interrupt is initialized by setting the Timer/Event Counter 0 interrupt request flag (; bit 5 of INTC), caused by a timer 0 overflow.
When the interrupt is enabled, the stack is not full and
the T0F bit is set, a subroutine call to location 08H will
occur. The related interrupt request flag (T0F) will be reset and the EMI bit cleared to disable further interrupts.
USB interrupts are triggered by the following USB
events and the related interrupt request flag (USBF; bit
4 of the INTC) will be set.
The internal Timer/Even Counter 1 interrupt is initialized
by setting the Timer/Event Counter 1 interrupt request
flag (;bit 6 of INTC), caused by a timer 1 overflow. When
the interrupt is enabled, the stack is not full and the T1F
is set, a subroutine call to location 0CH will occur. The
related interrupt request flag (T1F) will be reset and the
EMI bit cleared to disable further interrupts.
· The corresponding USB FIFO is accessed from the
PC
· The USB suspends signal from the PC
· The USB resumes signal from the PC
· The USB sends Reset signal
When the interrupt is enabled, the stack is not full and
the USB interrupt is active, a subroutine call to location
04H will occur. The interrupt request flag (USBF) and
EMI bits will be cleared to disable other interrupts.
During the execution of an interrupt subroutine, other interrupt acknowledge signals are held until the ²RETI² instruction is executed or the EMI bit and the related
interrupt control bit are set to ²1² (if the stack is not full).
To return from the interrupt subroutine, ²RET² or ²RETI²
may be invoked. RETI will set the EMI bit to enable an interrupt service, but RET will not.
When the PC Host access the FIFO of the HT82K94E/
HT82K94A, the corresponding request bit of the USR is
set, and a USB interrupt is triggered. So user can easily
decide which FIFO is accessed. When the interrupt has
Bit No.
Label
Function
0
EMI
Controls the master (global) interrupt (1= enabled; 0= disabled)
1
EUI
Controls the USB interrupt (1= enabled; 0= disabled)
2
ET0I
Controls the Timer/Event Counter 0 interrupt (1= enabled; 0= disabled)
3
ET1I
Controls the Timer/Event Counter 1 interrupt (1= enabled; 0= disabled)
4
USBF
USB interrupt request flag (1= active; 0= inactive)
5
T0F
Internal Timer/Event Counter 0 request flag (1= active; 0= inactive)
6
T1F
Internal Timer/Event Counter 1 request flag (1= active; 0= inactive)
7
¾
Unused bit, read as ²0²
INTC (0BH) Register
Rev. 2.30
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HT82K94E/HT82K94A
a crystal, a resonator can also be connected between
OSC1 and OSC2 to get a frequency reference, but two
external capacitors in OSC1 and OSC2 are required.
Interrupts, occurring in the interval between the rising
edges of two consecutive T2 pulses, will be serviced on
the latter of the two T2 pulses, if the corresponding interrupts are enabled. In the case of simultaneous requests
the following table shows the priority that is applied.
These can be masked by resetting the EMIbit.
Interrupt Source
The WDT oscillator is a free running on-chip RC oscillator, and no external components are required. Even if
the system enters the power down mode, the system
clock is stopped, but the WDT oscillator still works within
a period of approximately 31ms. The WDT oscillator can
be disabled by ROM code option to conserve power.
Priority Vector
USB interrupt
1
04H
Timer/Event Counter 0 overflow
2
08H
Timer/Event Counter 1 overflow
3
0CH
Watchdog Timer - WDT
The WDT clock source is implemented by a dedicated
RC oscillator (WDT oscillator), or instruction clock (system clock divided by 4), determines the ROM code option. This timer is designed to prevent a software
malfunction or sequence from jumping to an unknown
location with unpredictable results. The Watchdog
Timer can be disabled by ROM code option. If the
Watchdog Timer is disabled, all the executions related
to the WDT result in no operation.
Once the interrupt request flags (TF, USBF) are set,
they will remain in the INTC register until the interrupts
are serviced or cleared by a software instruction. It is
recommended that a program does not use the ²CALL
subroutine² within the interrupt subroutine. Interrupts often occur in an unpredictable manner or need to be serviced immediately in some applications. If only one stack
is left and enabling the interrupt is not well controlled, the
original control sequence will be damaged once the
²CALL² operates in the interrupt subroutine.
Once the internal WDT oscillator (RC oscillator, normally with a period of 31ms/5V) is selected, it is first divided by 256 (8-stage) to get the nominal time-out
period of 8ms/5V. This time-out period may vary with
temperatures, VDD and process variations. By invoking
the WDT prescaler, longer time-out periods can be realized. Writing data to WS2, WS1, WS0 (bits 2, 1, 0 of the
WDTS) can give different time-out periods. If WS2,
WS1, and WS0 are all equal to 1, the division ratio is up
to 1:128, and the maximum time-out period is 1s/5V. If
the WDT oscillator is disabled, the WDT clock may still
come from the instruction clock and operates in the
same manner except that in the HALT state the WDT
may stop counting and lose its protecting purpose. In
this situation the logic can only be restarted by external
logic. The high nibble and bit 3 of the WDTS are reserved for user¢s defined flags, which can only be set to
²10000² (WDTS.7~WDTS.3).
Oscillator Configuration
There is an oscillator circuits in the microcontroller.
O S C 1
O S C 2
C r y s ta l O s c illa to r
System Oscillator
This oscillator is designed for system clocks. The HALT
mode stops the system oscillator and ignores an external signal to conserve power.
A crystal across OSC1 and OSC2 is needed to provide
the feedback and phase shift required for the oscillator.
No other external components are required. In stead of
S y s te m
C lo c k /4
W D T
O S C
W D T P r e s c a le r
R O M
C o d e
O p tio n
S e le c t
8 - b it C o u n te r
7 - b it C o u n te r
8 -to -1 M U X
W S 0 ~ W S 2
W D T T im e - o u t
Watchdog Timer
Rev. 2.30
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May 18, 2012
HT82K94E/HT82K94A
If the device operates in a noisy environment, using the
on-chip 32kHz RC oscillator (WDT OSC) is strongly recommended, since the HALT will stop the system clock.
WS2
WS1
WS0
0
0
0
1:1
0
0
1
1:2
cuting the ²CLR WDT² instruction and is set when executing the ²HALT² instruction. The TO flag is set if the
WDT time-out occurs, and causes a wake-up that only
resets the Program Counter and Stack Pointer, the others remain in their original status.
Division Ratio
0
1
0
1:4
0
1
1
1:8
1
0
0
1:16
1
0
1
1:32
1
1
0
1:64
1
1
1
1:128
The I/O ports wake-up and interrupt methods can be
considered as a continuation of normal execution. Each
bit in the Port A can be independently selected to
wake-up the device by option. PB, PC and PD can also
be selected to wake-up the device by option. Upon
awakening from an I/O port stimulus, the program will
resume execution of the next instruction. If it awakens
from an interrupt, two sequence may occur. If the related
interrupt is disabled or the interrupt is enabled but the
stack is full, the program will resume execution at the
next instruction. If the interrupt is enabled and the stack
is not full, the regular interrupt response takes place. If
an interrupt request flag is set to ²1² before entering the
HALT mode, the wake-up function of the related interrupt will be disabled. Once a wake-up event occurs, it
takes 1024 tSYS (system clock period) to resume normal
operation. In other words, a dummy period will be inserted after a wake-up. If the wake-up results from an interrupt acknowledge signal, the actual interrupt
subroutine execution will be delayed by one or more cycles. If the wake-up results in the next instruction execution, this will be executed immediately after the dummy
period is completed.
WDTS (09H) Register
The WDT overflow under normal operation will initialize
a ²chip reset² and set the status bit ²TO². But in the
HALT mode, the overflow will initialize a ²warm reset²
and only the Program Counter and SP are reset to zero.
To clear the contents of the WDT (including the WDT
prescaler), three methods are employed; external reset
(a low level to RES), software instruction and a ²HALT²
instruction. The software instruction include ²CLR
WDT² and the other set - ²CLR WDT1² and ²CLR
WDT2². Of these two types of instruction, only one can
be active depending on the ROM code option - ²CLR
WDT times selection option². If the ²CLR WDT² is selected (i.e. CLRWDT times equal one), any execution of
the ²CLR WDT² instruction will clear the WDT. In the
case wherein ²CLR WDT1² and ²CLR WDT2² are chosen (i.e. CLRWDT times is equal to two), these two instructions must be executed to clear the WDT,
otherwise, the WDT may reset the chip as a result of
time-out.
To minimize power consumption, all the I/O pins should
be carefully managed before entering the HALT status.
Reset
There are three ways in which a reset can occur:
· RES reset during normal operation
· RES reset during HALT
Power Down Operation - HALT
· WDT time-out reset during normal operation
The HALT mode is initialized by the ²HALT² instruction
and results in the following:
The WDT time-out during HALT is different from other
chip reset conditions, since it can perform a ²warm re set² that resets only the Program Counter and SP, leaving the other circuits in their original state. Some registers remain unchanged during other reset conditions.
Most registers are reset to the ²initial condition² when
the reset conditions are met. By examining the PDF and
TO flags, the program can distinguish between different
²chip resets².
· The system oscillator will be turned off but the WDT
oscillator remains running (if the WDT oscillator is selected).
· The contents of the on-chip RAM and registers remain
unchanged.
· WDT and WDT prescaler will be cleared and recounted again (if the WDT clock is from the WDT oscillator).
· All of the I/O ports maintain their original status.
· The PDF flag is set and the TO flag is cleared.
The system can leave the HALT mode by means of an
external reset, an interrupt, an external falling edge signal on I/O ports or a WDT overflow. An external reset
causes a device initialization and the WDT overflow performs a ²warm reset². After the TO and PDF flags are
examined, the cause for chip reset can be determined.
The PDF flag is cleared by a system power-up or exeRev. 2.30
TO
PDF
0
0
RES reset during power-up
RESET Conditions
0
0
RES reset during normal operation
0
0
RES wake-up HALT
1
u
WDT time-out during normal operation
1
1
WDT wake-up HALT
Note: ²u² stands for ²unchanged²
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HT82K94E/HT82K94A
To guarantee that the system oscillator is started and
stabilized, the SST (System Start-up Timer) provides an
extra delay of 1024 system clock pulses when the system resets (power-up, WDT time-out or RES reset) or
when the system awakes from the HALT state.
The functional unit chip reset status are shown below.
When a system reset occurs, an SST delay is added
during the reset period. Any wake-up from HALT will enable the SST delay.
tS
000H
Interrupt
Disable
Prescaler
Clear
WDT
Clear. After master reset,
WDT begins counting
Timer/event Counter Off
V D D
R E S
Program Counter
S T
Input/output Ports
Input mode
Stack Pointer
Points to the top of the stack
S S T T im e - o u t
C h ip
R e s e t
H A L T
Reset Timing Chart
W a rm
R e s e t
W D T
R E S
C o ld
R e s e t
O S C 1
S S T
1 0 - b it R ip p le
C o u n te r
S y s te m
R e s e t
Reset Configuration
Reset Circuit
The status of the registers are summarized in the following table.
Reset
(Power On)
WDT
Time-out
(Normal
Operation)
RES Reset
(Normal
Operation)
RES Reset
(HALT)
WDT
Time-Out
(HALT)*
USB-Reset
(Normal)
USB-Reset
(HALT)
TMR0
xxxx xxxx
0000 0000
0000 0000
0000 0000
uuuu uuuu
uuuu uuuu
uuuu uuuu
TMR0C
00-0 1000
00-0 1000
00-0 1000
00-0 1000
uu-u uuuu
00-0 1000
00-0 1000
TMR1H
xxxx xxxx
0000 0000
0000 0000
0000 0000
uuuu uuuu
uuuu uuuu
uuuu uuuu
TMR1L
xxxx xxxx
0000 0000
0000 0000
0000 0000
uuuu uuuu
uuuu uuuu
uuuu uuuu
TMR1C
00-0 1---
00-0 1---
00-0 1---
00-0 1---
uu-u u---
00-0 1---
00-0 1---
Program
Counter
000H
000H
000H
000H
000H
000H
000H
MP0
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
MP1
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
ACC
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
TBLP
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
TBLH
-xxx xxxx
-uuu uuuu
-uuu uuuu
-uuu uuuu
-uuu uuuu
-uuu uuuu
-uuu uuuu
Register
STATUS
--00 xxxx
--1u uuuu
--00 uuuu
--00 uuuu
--11 uuuu
--uu uuuu
--01 uuuu
INTC
-000 0000
-000 0000
--00 uuuu
-000 0000
-uuu uuuu
-000 0000
-000 0000
WDTS
1000 0111
1000 0111
1000 0111
1000 0111
uuuu uuuu
1000 0111
1000 0111
PA
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
1111 1111
1111 1111
PAC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
1111 1111
1111 1111
PB
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
1111 1111
1111 1111
Rev. 2.30
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May 18, 2012
HT82K94E/HT82K94A
Reset
(Power On)
WDT
Time-out
(Normal
Operation)
RES Reset
(Normal
Operation)
RES Reset
(HALT)
WDT
Time-Out
(HALT)*
USB-Reset
(Normal)
USB-Reset
(HALT)
PBC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
1111 1111
1111 1111
PC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
1111 1111
1111 1111
PCC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
1111 1111
1111 1111
PD
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
1111 1111
1111 1111
PDC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
1111 1111
1111 1111
PE
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
1111 1111
1111 1111
Register
PEC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
1111 1111
1111 1111
PIPE_CTRL
0000 1110
0000 uuuu
0000 1110
0000 1110
0000 uuuu
0000 1110
0000 1110
AWR
0000 0000
uuuu uuuu
0000 0000
0000 0000
uuuu uuuu
0000 0000
0000 0000
PIPE
0000 0000
xxxx xxxx
0000 0000
0000 0000
xxxx xxxx
0000 0000
0000 0000
STALL
0000 1110
0000 uuuu
0000 1110
0000 1110
0000 uuuu
0000 1110
0000 1110
SIES
0100 0000
uxux xuuu
0100 0000
0100 0000
uxux xuuu
0100 0000
0100 0000
MISC
0x00 0000
uxuu uuuu
0x00 0000
0x00 0000
uxuu uuuu
0x00 0000
0x00 0000
Endpt_EN
0000 1111
0000 uuuu
0000 1111
0000 1111
0000 uuuu
0000 1111
0000 1111
FIFO0
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
0000 0000
0000 0000
FIFO1
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
0000 0000
0000 0000
FIFO2
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
0000 0000
0000 0000
FIFO3
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
0000 0000
0000 0000
USC
11xx 0000
11xx uu0u
11xx 0000
11xx 0000
uuxx uuuu
uu00 0u00
uu00 0u00
USR
0000 0000
uuuu 0000
0000 0000
0000 0000
uuuu uuuu
u0uu 0000
u0uu 0000
SCC
0000 0010
uuu0 u0u0
0000 0010
0000 0010
uuuu uuu0
0uu0 u000
0uu0 u000
TBHP
---x xxxx
---0 uuuu
---0 uuuu
---0 uuuu
---0 uuuu
---0 uuuu
---0 uuuu
Note:
²*² stands for ²warm reset²
²u² stands for ²unchanged²
²x² stands for ²unknown²
Timer/Event Counter
Two timer/event counters (TMR0, TMR1) are implemented in the microcontroller. The Timer/Event Counter
0 contains an 8-bit programmable count-up counter and
the clock may comes from an external source or from
fSYS/4.
The Timer/Event Counter 1 contains an 16-bit programmable count-up counter and the clock may come from
an external source or from the system clock divided by
4.
Bit No.
Label
0~2, 5
¾
Unused bit, read as ²0²
3
TE
To define the TMR0 active edge of Timer/Event Counter 0
(0=active on low to high; 1=active on high to low)
4
TON
To enable/disable timer 0 counting (0=disabled; 1=enabled)
TM0
TM1
To define the operating mode
01=Event count mode (external clock)
10=Timer mode (internal clock)
11=Pulse width measurement mode
00=Unused
6
7
Function
TMR0C (0EH) Register
Rev. 2.30
14
May 18, 2012
HT82K94E/HT82K94A
Bit No.
Label
Function
0~2, 5
¾
Unused bit, read as ²0²
3
TE
To define the TMR1 active edge of Timer/Event Counter 1
(0=active on low to high; 1=active on high to low)
4
TON
To enable/disable timer 1 counting (0=disabled; 1=enabled)
6
7
TM0
TM1
To define the operating mode
01=Event count mode (external clock)
10=Timer mode (internal clock)
11=Pulse width measurement mode
00=Unused
TMR1C (11H) Register
fS
Y S
D a ta B u s
/4
T M 1
T M 0
T im e r /E v e n t C o u n te r 0
P r e lo a d R e g is te r
T M R 0
R e lo a d
T E
T im e r /E v e n t
C o u n te r 0
P u ls e W id th
M e a s u re m e n t
M o d e C o n tro l
T M 1
T M 0
T O N
O v e r flo w
to In te rru p t
Timer/Event Counter 0
D a ta B u s
fS
Y S /4
T M 1
T M 0
1 6 B its
T im e r /E v e n t C o u n te r
P r e lo a d R e g is te r
T M R 1
R e lo a d
T E
T M 1
T M 0
T O N
L o w B y te
B u ffe r
1 6 B its
T im e r /E v e n t C o u n te r
(T M R 1 H /T M R 1 L )
P u ls e W id th
M e a s u re m e n t
M o d e C o n tro l
O v e r flo w
to In te rru p t
Timer/Event Counter 1
There are 3 registers related to Timer/Event Counter 1;
TMR1H (0FH), TMR1L (10H), TMR1C (11H). Writing
TMR1L will only put the written data to an internal
lower-order byte buffer (8 bits) and writing TMR1H will
transfer the specified data and the contents of the
lower-order byte buffer to TMR1H and TMR1L preload
registers, respectively. The Timer/Event Counter 1
preload register is changed by each writing TMR1H operations. Reading TMR1H will latch the contents of
TMR1H and TMR1L counters to the destination and the
lower-order byte buffer, respectively. Reading the
TMR1L will read the contents of the lower-order byte
buffer. The TMR1C is the Timer/Event Counter 1 control
register, which defines the operating mode, counting enable or disable and active edge.
Using the internal clock source, there is only 1 reference
time-base for Timer/Event Counter 0. The internal clock
source is coming from fSYS/4.
The external clock input allows the user to count external events, measure time intervals or pulse widths.
Using the internal clock source, there is only 1 reference
time-base for Timer/Event Counter 1. The internal clock
source is coming from fSYS/4. The external clock input
allows the user to count external events, measure time
intervals or pulse widths.
There are 2 registers related to the Timer/Event Counter
0; TMR0 ([0DH]), TMR0C ([0EH]). Two physical registers are mapped to TMR0 location; writing TMR0 makes
the starting value be placed in the Timer/Event Counter
0 preload register and reading TMR0 gets the contents
of the Timer/Event Counter 0. The TMR0C is a
timer/event counter control register, which defines some
options.
Rev. 2.30
The TM0, TM1 bits define the operating mode. The
event count mode is used to count external events,
which means the clock source comes from an external
15
May 18, 2012
HT82K94E/HT82K94A
In the case of Timer/Event Counter 0/1 OFF condition,
writing data to the Timer/Event Counter 0/1 preload register will also reload that data to the Timer/Event Counter
0/1. But if the Timer/Event Counter 0/1 is turned on, data
written to it will only be kept in the Timer/Event Counter
0/1 preload register. The Timer/Event Counter 0/1 will still
operate until overflow occurs (a Timer/Event Counter 0/1
reloading will occur at the same time). When the
Timer/Event Counter 0/1 (reading TMR0/TMR1) is read,
the clock will be blocked to avoid errors. As clock blocking
may results in a counting error, this must be taken into
consideration by the programmer.
(TMR0/TMR1) pin. The timer mode functions as a normal timer with the clock source coming from the fSYS/4
(Timer0/Timer1). The pulse width measurement mode
can be used to count the high or low level duration of the
external signal (TMR0/TMR1). The counting is based on
the fSYS/4 (Timer0/Timer1).
In the event count or timer mode, once the Timer/Event
Counter 0/1 starts counting, it will count from the current
contents in the Timer/Event Counter 0/1 to FFH or
FFFFH. Once overflow occurs, the counter is reloaded
from the Timer/Event Counter 0/1 preload register and
generates the interrupt request flag (T0F/T1F; bit 5/6 of
INTC) at the same time.
Input/Output Ports
In the pulse width measurement mode with the TON
and TE bits equal to one, once the TMR0/TMR1 has received a transient from low to high (or high to low if the
TE bits is ²0²) it will start counting until the TMR0/TMR1
returns to the original level and resets the TON. The
measured result will remain in the Timer/Event Counter
0/1 even if the activated transient occurs again. In other
words, only one cycle measurement can be done. Until
setting the TON, the cycle measurement will function
again as long as it receives further transient pulse. Note
that, in this operating mode, the Timer/Event Counter
0/1 starts counting not according to the logic level but
according to the transient edges. In the case of counter
overflows, the counter 0/1 is reloaded from the
Timer/Event Counter 0/1 preload register and issues the
interrupt request just like the other two modes. To enable the counting operation, the timer ON bit (TON; bit 4
of TMR0C/TMR1C) should be set to 1. In the pulse width
measurement mode, the TON will be cleared automatically after the measurement cycle is completed. But in
the other two modes the TON can only be reset by instructions. The overflow of the Timer/Event Counter 0/1
is one of the wake-up sources. No matter what the operation mode is, writing a 0 to ET0I/ET1I can disable the
corresponding interrupt services.
There are 40 bidirectional input/output lines in the
microcontroller, labeled from PA to PE, which are
mapped to the data memory of [12H], [14H], [16H],
[18H] and [1AH] respectively. All of these I/O ports can
be used for input and output operations. For input operation, these ports are non-latching, that is, the inputs
must be ready at the T2 rising edge of instruction ²MOV
A,[m]² (m=12H, 14H, 16H, 18H or 1AH). For output operation, all the data is latched and remains unchanged
until the output latch is rewritten.
Each I/O line has its own control register (PAC, PBC,
PCC, PDC, PEC) to control the input/output configuration. With this control register, CMOS/NMOS/PMOS
output or Schmitt trigger input with or without pull-high
resistor structures can be reconfigured dynamically under software control. To function as an input, the corresponding latch of the control register must write a ²1².
The input source also depends on the control register. If
the control register bit is ²1², the input will read the pad
state. If the control register bit is ²0², the contents of the
latches will move to the internal bus. The latter is possible in the ²read-modify-write² instruction. For output
function, CMOS is the only except port A which can be
V
D a ta B u s
W r ite C o n tr o l R e g is te r
D D
C o n tr o l B it
P u ll- h ig h
Q
D
Q
C K
S
P A 0
P B 0
P C 0
P D 0
P E 0
C h ip R e s e t
R e a d C o n tr o l R e g is te r
W r ite D a ta R e g is te r
D a ta B it
Q
D
C K
S
~ P A
~ P B
~ P C
~ P D
~ P E
6 , P D 4 /T M R 0
7
7
7
7
Q
P A O u tp u t
C o n fig u r a tio n
P u ll- lo w
M
U
R e a d D a ta R e g is te r
W a k e -u p fo r a n y I/O
P o rt
X
W a k e - u p O p tio n fo r a n y I/O
P o rt
P A 7 /T M R 1
Input/Output Ports
Rev. 2.30
16
May 18, 2012
HT82K94E/HT82K94A
optioned as CMOS/NMOS/PMOS configurations.
These control registers are mapped to locations 13H,
15H, 17H and 19H.
The LVR includes the following specifications:
· For a valid LVR signal, a low voltage i.e. a voltage in
the range between 0.9V~VLVR must exist for greater
than 1ms. If the low voltage state does not exceed
1ms, the LVR will ignore it and do not perform a reset
function.
After a chip reset, these input/output lines remain at high
levels or floating state (depending on the pull-high options). Each bit of these input/output latches can be set
or cleared by ²SET [m].i² and ²CLR [m].i² (m=12H, 14H,
16H or 18H) instructions.
· The LVR uses the ²OR² function with the external
RES signal to perform chip reset.
The relationship between VDD and VLVR is shown below.
Some instructions first input data and then follow the
output operations. For example, ²SET [m].i², ²CLR
[m].i², ²CPL [m]², ²CPLA [m]² read the entire port states
into the CPU, execute the defined operations
(bit-operation), and then write the results back to the
latches or the accumulator.
V D D
5 .5 V
V
O P R
5 .5 V
V
L V R
2 .2 V ~ 2 .4 V
Each line of all the I/O ports have the capability of waking up the device.
2 .0 V ~ 2 .2 V
There are pull-high options available for I/O lines. Once
the pull-high option of an I/O line is selected, the I/O line
have pull-high resistor. Otherwise, the pull-high resistor
is absent. It should be noted that a non-pull-high I/O line
operating in input mode will cause a floating state.
0 .9 V
Note:
There is a low voltage detector (LVD) and a low voltage
reset circuit (LVR) implemented in the microcontrollers.
Where LVR function can be enabled/disabled by options. User can read the LVD detector status (0/1) from
MISC.5. The LVR has the same effect or function with
the external RES signal which performs a chip reset.
Both LVR and LVD functions will disable in the HALT
mode.
It is recommended that unused or not bonded out I/O
lines should be set as output pins by software instruction
to avoid consuming power under input floating state.
Low Voltage Reset/Detector - LVR/LVD
The microcontroller contains a low voltage reset circuit
in order to monitor the supply voltage of the device. If the
supply voltage of the device drops to within a range of
0.9V~VLVR such as might occur when changing the battery, the LVR will automatically reset the device internally.
V
VOPR is the voltage range for proper chip operation at 4MHz system clock.
There are two kind of LVR/LVD definition: 2-battery or
3-battery option.
When 2-battery option is selected: LVR=2.2V;
LVD=2.4V. Otherwise, 3-battery option is selected:
LVR=2.4V; LVD=2.6V.
D D
5 .5 V
V
L V R
L V R
D e te c t V o lta g e
0 .9 V
0 V
R e s e t S ig n a l
R e s e t
N o r m a l O p e r a tio n
R e s e t
*1
*2
Low Voltage Reset
Note:
*1. To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
clock pulses before entering the normal operation.
*2. Since low voltage has to be maintained for over 1ms in its original state, therefore there¢s a 1ms delay
before entering the reset mode
Rev. 2.30
17
May 18, 2012
HT82K94E/HT82K94A
Suspend Wake-Up and Remote Wake-Up
The device with remote wake-up function can wake-up the
USB Host by sending a wake-up pulse through RMWK (bit
1 of the USC). Once the USB Host receives a wake-up
signal from the HT82K94E/HT82K94A, it will send a Resume signal to the device. The timing is as follows:
If there is no signal on the USB bus for over 3ms, the
HT82K94E/HT82K94A will go into suspend mode. The
Suspend line (bit 0 of the USC) will be set to ²1² and a
USB interrupt is triggered to indicate that the
HT82K94E/HT82K94A should jump to the suspend
state to meet the 500mA USB suspend current spec.
S U S P E N D
M in . 1 U S B C L K
In order to meet the 500mA suspend current, the firmware should disable the USB clock by clearing the
USBCKEN (bit3 of the SCC) to ²0². The suspend current is 400mA.
R M W K
M in .2 .5 m s
U S B R e s u m e S ig n a l
When the resume signal is sent out by the host, the
HT82K94E/HT82K94A will wake-up the MCUby USB interrupt and the Resume line (bit 3 of the USC) is set. In
order to make the HT82K94E/HT82K94A function properly, the firmware must set the USBCKEN (bit 3 of the
SCC) to ²1². Since the Resume signal will be cleared
before the Idle signal is sent out by the host, the Suspend line (bit 0 of the USC) will be set to ²0². So when
the MCU is detecting the Suspend line (bit0 of USC), the
Resume line should be remembered and taken into consideration.
U S B _ IN T
Configuring the Device as a PS2 Device
The HT82K94E/HT82K94A can be configured as a USB
interface or PS2 interface device, by configuring the
SPS2 (bit 4 of USR) and SUSB (bit 5 of the USR). If
SPS2=1, and SUSB=0, the HT82K94E/HT82K94A is
configured as a PS2 interface, pin USBD- is configured
as a PS2 Data pin and USBD+ is configured as a PS2 Clk
pin. User can easily read or write to the PS2 Data or PS2
Clk pin by accessing the corresponding bit PS2DAI (bit 4
of the USC), PS2CKI (bit 5 of the USC), PS2DAO (bit 6 of
the USC) and S2CKO (bit 7 of the USC) respectively.
After finishing the resume signal, the suspend line will
go inactive and a USB interrupt is triggered. The following is the timing diagram.
User should make sure that in order to read the data
properly, the corresponding output bit must be set to ²1².
For example, if it is desired to read the PS2 Data by
reading PS2DAI, the PS2DAO should set to ²1². Otherwise it is always read as ²0².
If SPS2=0, and SUSB=1, the HT82K94E/HT82K94A is
configured as a USB interface. Both the USBD- and
USBD+ is driven by the SIE of the HT82K94E/
HT82K94A. User can only write or read the USB data
through the corresponding FIFO.
Both SPS2 and SUSB default is ²0².
USB Interface
There are eleven registers, including PIPE_CTRL (41H in bank 1), AWR (address + remote wake-up 42H in bank 1),
STALL (43H in bank 1), PIPE (44H in bank 1), SIES (45H in bank 1), MISC (46H in bank 1), Endpt_EN (47H in bank 1),
FIFO0 (48H in bank 1), FIFO1 (49H in bank 1), FIFO2 (4AH in bank 1) and FIFO3 (4BH in bank 1) used for the USB
function. AWR register contains current address and a remote wake up function control bit. The initial value of AWR is
²00H². The address value extracted from the USB command is not to be loaded into this register until the SETUP stage
is completed.
Bit No.
Label
R/W
0
WKEN
W
Remote wake-up enable/disable
Function
7~1
AD6~AD0
W
USB device address
AWR (42H) Register
Rev. 2.30
18
May 18, 2012
HT82K94E/HT82K94A
STALL, PIPE, PIPE_CTRL and Endpt_EN Registers
PIPE register represents whether the endpoint corresponding is accessed by host or not. After ACT_EN signal being
sent out, MCU can check which endpoint had been accessed. This register is set only after the time when host access
the corresponding endpoint.
STALL register shows whether the endpoint corresponding works or not. As soon as the endpoint work improperly, the
bit corresponding must be set.
PIPE_CTRL Register is used for configuring IN (Bit=1) or OUT (Bit=0)Pipe. The default is define IN pipe. Where Bit0
(DATA0) of the PIPE_CTRL Register is used to setting the data toggle of any endpoint (except endpoint0) using data
toggles to the value DATA0. Once the user want the any endpoint (except endpoint0) using data toggles to the value
DATA0. the user can output a LOW pulse to this bit. The LOW pulse period must at least 10 instruction cycle.
Endpt_EN Register is used to enable or disable the corresponding endpoint (except endpoint 0) Enable Endpoint
(Bit=1) or disable Endpoint (Bit=0)
The bitmaps are list as follows :
Register
Name
R/W
Register
Address
Bit7~Bit4 Reserved
Bit 3
Bit 2
Bit 1
Bit 0
Default
Value
PIPE_CTRL
R/W
01000001B
¾
Pipe 3
Pipe 2
Pipe 1
Pipe 0
00001111
STALL
R/W
01000011B
¾
Pipe 3
Pipe 2
Pipe 1
Pipe 0
00001111
R
01000100B
¾
Pipe 3
Pipe 2
Pipe 1
Pipe 0
00000000
R/W
01000001B
¾
Pipe 3
Pipe 2
Pipe 1
Pipe 0
00001111
PIPE
Endpt_EN
PIPE_CTRL (41H), STALL (43H), PIPE (44H) and Endpt_EN (47H) Registers
The SIES Register is used to indicate the present signal state which the SIE receives and also defines whether the SIE
has to change the device address automatically.
Bit No.
Function
Read/Write
7
MNI
R/W
6~2
¾
¾
1
F0_ERR
R/W
0
Adr_set
R/W
Register Address
01000001B
SIES (45H) Register
Func. Name
R/W
Description
Adr_ set
R/W
This bit is used to configure the SIE to automatically change the device address with the
value of the Address+Remote_WakeUp Register (42H).
When this bit is set to ²1² by F/W, the SIE will update the device address with the value of
the Address+Remote_WakeUp Register (42H) after the PC Host has successfully read the
data from the device by the IN operation. The SIE will clear the bit after updating the device
address. Otherwise, when this bit is cleared to ²0², the SIE will update the device address
immediately after an address is written to the Address+Remote_WakeUp Register (42H).
Default 0
F0_Err
R/W
This bit is used to indicate that some errors have occurred when accessing the FIFO0.
This bit is set by SIE and cleared by F/W. Default 0
¾
¾
NMI
R/W
Unused bit, read as ²0²
This bit is used to control whether the USB interrupt is output to the MCU in NAK response
to the PC Host IN or OUT token.
1: has only USB interrupt, data is transmitted to the PC host or data is received from the PC
Host
0: always has USB interrupt if the USB accesses FIFO0. Default 0
SIES Function
Rev. 2.30
19
May 18, 2012
HT82K94E/HT82K94A
MISC register combines a command and status to control desired endpoint FIFO action and to show the status of the
desired endpoint FIFO. The MISC will be cleared by USB reset signal.
Bit No.
Label
R/W
Function
0
REQ
R/W
After setting the other status of the desired one in the MISC, endpoint FIFO can be
requested by setting this bit to ²1². After the job has been done, this bit has to be
cleared to ²0².
1
TX
R/W
This bit defines the direction of data transferring between MCU and endpoint FIFO.
When the TX is set to ²1², this means that the MCU wants to write data to the endpoint FIFO. After the job has been done, this bit has to be cleared to ²0² before terminating request to represent the end of transferring. For reading action, this bit has to
be cleared to ²0² to represent that MCU wants to read data from the endpoint FIFO
and has to be set to ²1² after the job is done.
2
CLEAR
R/W
Clear the requested endpoint FIFO, even if the endpoint FIFO is not ready.
4
3
SELP1
SELP0
R/W
Defines which endpoint FIFO is selected, SELP1,SELP0:
00: endpoint FIFO0
01: endpoint FIFO1
10: endpoint FIFO2
11: endpoint FIFO3
5
SCMD
R/W
Used to show that the data in endpoint FIFO is a SETUP command. This bit has to
be cleared by firmware. That is to say, even the MCU is busy, the device will not miss
any SETUP commands from the host.
6
READY
R
Read only status bit, this bit is used to indicate that the desired endpoint FIFO is
ready to work.
7
LEN0
R/W
Used to indicate that a 0-sized packet is sent from a host to the MCU. This bit should
be cleared by firmware.
MISC (46H) Register
The MCU can communicate with the endpoint FIFO by setting the corresponding registers, of which address is listed in
the following table. After reading the current data, next data will show after 2ms, used to check the endpoint FIFO status
and response to MISC register, if read/write action is still going on.
Registers
R/W
Bank
Address
Bit7~Bit0
FIFO0
R/W
1
48H
Data7~Data0
FIFO1
R/W
1
49H
Data7~Data0
FIFO2
R/W
1
4AH
Data7~Data0
FIFO3
R/W
1
4BH
Data7~Data0
There are some timing constrains and usages illustrated here. By setting the MISC register, MCU can perform reading,
writing and clearing actions. There are some examples shown in the following table for endpoint FIFO reading, writing
and clearing.
Actions
MISC Setting Flow and Status
Read FIFO0 sequence
00H®01H®delay 2ms, check 41H®read* from FIFO0 register and
check not ready (01H)®03H®02H
Write FIFO1 sequence
0AH®0BH®delay 2ms, check 4BH®write* to FIFO1 register and
check not ready (0BH)®09H®08H
Check whether FIFO0 can be read or not
00H®01H®delay 2ms, check 41H (ready) or 01H (not ready)®00H
Check whether FIFO1 can be written or not
0AH®0BH®delay 2ms, check 4BH (ready) or 0BH (not ready)®0AH
Read 0-sized packet sequence form FIFO0
00H®01H®delay 2ms, check 81H®read once (01H)®03H®02H
Write 0-sized packet sequence to FIFO1
0AH®0BH®delay 2ms, check 0BH®0FH®0DH®08H
Note:
*: There are 2ms existing between 2 reading action or between 2 writing action
Rev. 2.30
20
May 18, 2012
HT82K94E/HT82K94A
USB/PS2 Status and Control Register
The register is used to indicate there are USB suspend, USB resume and USB reset signal in USB bus. Also user can
output a high pulse in RMWK bit to wake-up the PC for USB remote function.
Bit No.
Label
R/W
Function
0
SUSP
R
Read only, USB suspend indication. When this bit is set to ²1² (set by SIE), it indicates the USB bus enters suspend mode. The USB interrupt is also triggered on any
changes of this bit.
1
RMWK
R/W
USB remote wake-up command. It is set by MCU to force the USB host leaving the
suspend mode. When this bit is set to ²1², 2ms delay for clearing this bit to ²0² is
needed to insure the RMWK command is accepted by SIE.
R/W
USB reset indication. This bit is set/cleared by USB SIE. This bit is used to detect
which bus (PS2 or USB) is attached. When the URST is set to ²1², this indicates that
a USB reset has occurred (the attached bus is USB) and a USB interrupt will be initialized.
2
URST
3
RESUME
R
USB resume indication. When the USB leaves the suspend mode, this bit is set to
²1² (set by SIE). This bit will appear 20ms waiting for the MCU to detect. When the
RESUME is set by the SIE, an interrupt will be generated to wake-up the MCU. In order to detect the suspend state, the MCU should set the USBCKEN and clear
SUSP2 (in SCC register) to enable the SIE detecting function. The RESUME will be
cleared while the SUSP is going ²0². When the MCU is detecting the SUSP, the RESUME (wakes-up the MCU ) should be remembered and taken into consideration.
4
PS2DAI
R
Read only, USBD-/DATA input
5
PS2CKI
R
Read only, USBD+/CLK input
6
PS2DAO
W
Data for driving the USBD-/DATA pin (Default=²1²)
7
PS2CKO
W
Data for driving the USBD+/CLK pin (Default=²1²)
USC (1CH) Register
USB Endpoint Interrupt Status Register
The register is used to indicate which endpoint is accessed or has external interrupt PA4/EXT is activated and to select
the serial bus (PS2 or USB). The endpoint request flags (EP0IF, EP1IF, EP2IF, EP3IF and EXTIF) are used to indicate
which endpoints are accessed. If an endpoint is accessed, the related endpoint request flag will be set to ²1² and the
USB interrupt will occur (if the USB interrupt is enabled and the stack is not full). When the active endpoint request flag
is served, the endpoint request flag has to be cleared to ²0².
Where USB_flag bit is only a bit for firmware to store the USB-mode data. This bit only clear to zero after power-on reset.
Bit No.
Label
R/W
Function
0
EP0IF
R/W
When this bit is set to ²1² (set by the SIE), it indicates the endpoint 0 is accessed and
a USB interrupt will occur. When the interrupt has been served, this bit should be
cleared by firmware.
1
EP1IF
R/W
When this bit is set to ²1² (set by the SIE), it indicates the endpoint 1 is accessed and
a USB interrupt will occur. When the interrupt has been served, this bit should be
cleared by firmware.
2
EP2IF
R/W
When this bit is set to ²1² (set by the SIE), it indicates the endpoint 2 is accessed and
a USB interrupt will occur. When the interrupt has been served, this bit should be
cleared by firmware.
3
EP3IF
R/W
When set to ²1², indicated endpoint 3 interrupt event . Must wait MCU to process interrupt event, then clear this bit by firmware. This bit must be 0, then next interrupt
event will be process. Default value is 0.
4
SPS2
R/W
The PS2 function is selected when this bit is set to ²1². (Default=²0²)
5
SUSB
R/W
6
¾
¾
7
USB_flag
R/W
The USB function is selected when this bit is set to ²1². (Default=²0²)
Undefined, should be cleared to ²0²
This flag is used to show the MCU is in USB mode. (Bit=1)
This bit is R/W by FW and will be cleared to ²0² after power-on reset. (Default=²0²)
USR (1DH) Register
Rev. 2.30
21
May 18, 2012
HT82K94E/HT82K94A
System Clock Control Register
This register is designed to control the system clock and make the device to meet USB 500mA suspend current spec. as
well as a LVD indicator.
Since the device can operate at 6MHz or 12MHz in USB mode, so in order to make SIE work properly, there should has
a SYSCLK bit to indicate what system frequency is working.
The USBCKEN bit is used to turn-off or turn-on the SIE system clock to meet the USB 500mA suspend current. For
normal operation, this bit must be 1. Otherwise, the SIE cannot detect the USB signal.
PS2_flag bit is only a bit for firmware to store the PS2 mode data. This bit only clear to zero by hardware after power-on
reset. SUSPEND2 bit is used to second suspend mode.
Bit No.
Label
R/W
Function
0, 2
¾
¾
1
OSC_ctrl
R/W
1: High driver of oscillator circuit for low voltage
0: normal driver of oscillator circuit
3
USBCKEN
R/W
USB clock control bit. When this bit is set to ²1², it indicates that the USB clock is enabled. Otherwise, the USB clock is turned-off. (Default=²0²)
Undefined, should be cleared to ²0²
4
SUSPEND2
R/W
This bit is used to reduce power consumption in the suspend mode. In the normal
mode this bit must be cleared to zero(Default=²0²). In the HALT mode this bit should
be set high to reduce power consumption and LVR with no function. In the USB
mode this bit cannot be set high.
5
PS2_flag
R/W
This flag is used to show the MCU is under PS2 mode. (Bit=1)
This bit is R/W by FW and will be cleared to ²0² after power-on reset. (Default=²0²)
6
SYSCLK
R/W
This bit is used to specify the system oscillator frequency used by the MCU. If a
6MHz crystal oscillator or resonator is used, this bit should be set to ²1². If a 12MHz
crystal oscillator or resonator is used, this bit should be cleared to ²0² (default).
7
LVD
R
1: battery voltage low
0: battery voltage high
SCC (1EH) Register
Table High Byte Pointer for Current Table Read TBHP (Address 0X1F)
Register
(0X1F)
Rev. 2.30
Bits
Labels
Read/Write
Option
Functions
4~0
PGC4~PGC0
R/W
¾
Store current table read bit12~bit8 data
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HT82K94E/HT82K94A
Options
The following table shows all kinds of option in the microcontroller. All of the options must be defined to ensure proper
system functioning.
No.
Option
1
Chip lock bit (by bit)
2
PA0~PA7 pull-high resistor enabled or disabled (by bit)
3
PB0~PB7 pull-high resistor enabled or disabled (by nibble)
4
PC0~PC7 pull-high resistor enabled or disabled (by nibble)
5
PD0~PD7 pull-high resistor enabled or disabled (by nibble)
6
PE0~PE7 pull-high resistor enabled or disabled (by nibble)
7
LVR enable or disable
8
WDT enable or disable
9
WDT clock source: fSYS/4 or WDTOSC
10
²CLRWDT² instruction(s): 1 or 2
11
PA0~PA7 output structures: CMOS/NMOS open-drain/PMOS open-drain (by bit)
12
PA0~PA7 wake-up enabled or disabled (by bit)
13
PB0~PB7 wake-up enabled or disabled (by nibble)
14
PC0~PC7 wake-up enabled or disabled (by nibble)
15
PD0~PD7 wake-up enabled or disabled (by nibble)
16
TBHP enable or disable (default disable)
17
LVR/LVD kind: 2-battery or 3-battery
Rev. 2.30
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HT82K94E/HT82K94A
Application Circuits
Crystal or Ceramic Resonator for Multiple I/O Applications - HT82K94E
5 W
V D D
*
U S B -
0 .1 m F
U S B +
*
3 3 W
1 0 m F
1 0 0 k W
P A 0 ~ P A 7
*
P B 0 ~ P B 7
V D D
P C 0 ~ P C 7
0 .1 m F
P D 0 ~ P D 7
P E 0 ~ P E 7
V S S
**
5 W
X 1
O S C 1
1 .5 k W
V 3 3 O
0 .1 m F
*
4 7 p F *
O S C 2
1 0 k W
0 .1 m F
*
**
0 .1 m F
R E S
3 3 W
*
U S B D -/D A T A
*
4 7 p F *
*
3 3 W
U S B D + /C L K
V S S
4 7 p F
*
*
4 7 p F
H T 8 2 K 9 4 E
Note:
The resistance and capacitance for reset circuit should be designed in such a way as to ensure that the VDD is
stable and remains within a valid operating voltage range before bringing RES high.
X1 can use 6MHz or 12MHz, X1 as close OSC1 & OSC2 as possible.
Components with * are used for EMC issue.
Components with ** are used for resonator only. If necessary.
Crystal or Ceramic Resonator for Multiple I/O Applications - HT82K94A
P A 0 ~ P A 7
V D D
V D D
U S B -
1 0 m F
1 0 0 k W
P B 0 ~ P B 7
0 .1 m F
P C 0 ~ P C 7
U S B +
P D 0 ~ P D 7
V S S
X 1
*
1 .5 k W
O S C 1
V 3 3 O
0 .1 m F
O S C 2
*
R E S
U S B D -/D A T A
0 .1 m F
U S B D + /C L K
V S S
H T 8 2 K 9 4 A
Note:
X1 can use 6MHz or 12MHz, X1 as close OSC1 & OSC2 as possible.
Components with ** are used for resonator only. If necessary.
Rev. 2.30
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HT82K94E/HT82K94A
Instruction Set
subtract instruction mnemonics to enable the necessary
arithmetic to be carried out. Care must be taken to ensure correct handling of carry and borrow data when results exceed 255 for addition and less than 0 for
subtraction. The increment and decrement instructions
INC, INCA, DEC and DECA provide a simple means of
increasing or decreasing by a value of one of the values
in the destination specified.
Introduction
C e n t ra l t o t h e s u c c e s s f u l o p e r a t i o n o f a n y
microcontroller is its instruction set, which is a set of program instruction codes that directs the microcontroller to
perform certain operations. In the case of Holtek
microcontrollers, a comprehensive and flexible set of
over 60 instructions is provided to enable programmers
to implement their application with the minimum of programming overheads.
Logical and Rotate Operations
For easier understanding of the various instruction
codes, they have been subdivided into several functional groupings.
The standard logical operations such as AND, OR, XOR
and CPL all have their own instruction within the Holtek
microcontroller instruction set. As with the case of most
instructions involving data manipulation, data must pass
through the Accumulator which may involve additional
programming steps. In all logical data operations, the
zero flag may be set if the result of the operation is zero.
Another form of logical data manipulation comes from
the rotate instructions such as RR, RL, RRC and RLC
which provide a simple means of rotating one bit right or
left. Different rotate instructions exist depending on program requirements. Rotate instructions are useful for
serial port programming applications where data can be
rotated from an internal register into the Carry bit from
where it can be examined and the necessary serial bit
set high or low. Another application where rotate data
operations are used is to implement multiplication and
division calculations.
Instruction Timing
Most instructions are implemented within one instruction cycle. The exceptions to this are branch, call, or table read instructions where two instruction cycles are
required. One instruction cycle is equal to 4 system
clock cycles, therefore in the case of an 8MHz system
oscillator, most instructions would be implemented
within 0.5ms and branch or call instructions would be implemented within 1ms. Although instructions which require one more cycle to implement are generally limited
to the JMP, CALL, RET, RETI and table read instructions, it is important to realize that any other instructions
which involve manipulation of the Program Counter Low
register or PCL will also take one more cycle to implement. As instructions which change the contents of the
PCL will imply a direct jump to that new address, one
more cycle will be required. Examples of such instructions would be ²CLR PCL² or ²MOV PCL, A². For the
case of skip instructions, it must be noted that if the result of the comparison involves a skip operation then
this will also take one more cycle, if no skip is involved
then only one cycle is required.
Branches and Control Transfer
Program branching takes the form of either jumps to
specified locations using the JMP instruction or to a subroutine using the CALL instruction. They differ in the
sense that in the case of a subroutine call, the program
must return to the instruction immediately when the subroutine has been carried out. This is done by placing a
return instruction RET in the subroutine which will cause
the program to jump back to the address right after the
CALL instruction. In the case of a JMP instruction, the
program simply jumps to the desired location. There is
no requirement to jump back to the original jumping off
point as in the case of the CALL instruction. One special
and extremely useful set of branch instructions are the
conditional branches. Here a decision is first made regarding the condition of a certain data memory or individual bits. Depending upon the conditions, the program
will continue with the next instruction or skip over it and
jump to the following instruction. These instructions are
the key to decision making and branching within the program perhaps determined by the condition of certain input switches or by the condition of internal data bits.
Moving and Transferring Data
The transfer of data within the microcontroller program
is one of the most frequently used operations. Making
use of three kinds of MOV instructions, data can be
transferred from registers to the Accumulator and
vice-versa as well as being able to move specific immediate data directly into the Accumulator. One of the most
important data transfer applications is to receive data
from the input ports and transfer data to the output ports.
Arithmetic Operations
The ability to perform certain arithmetic operations and
data manipulation is a necessary feature of most
microcontroller applications. Within the Holtek
microcontroller instruction set are a range of add and
Rev. 2.30
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HT82K94E/HT82K94A
Bit Operations
Other Operations
The ability to provide single bit operations on Data Memory is an extremely flexible feature of all Holtek
microcontrollers. This feature is especially useful for
output port bit programming where individual bits or port
pins can be directly set high or low using either the ²SET
[m].i² or ²CLR [m].i² instructions respectively. The feature removes the need for programmers to first read the
8-bit output port, manipulate the input data to ensure
that other bits are not changed and then output the port
with the correct new data. This read-modify-write process is taken care of automatically when these bit operation instructions are used.
In addition to the above functional instructions, a range
of other instructions also exist such as the ²HALT² instruction for Power-down operations and instructions to
control the operation of the Watchdog Timer for reliable
program operations under extreme electric or electromagnetic environments. For their relevant operations,
refer to the functional related sections.
Instruction Set Summary
The following table depicts a summary of the instruction
set categorised according to function and can be consulted as a basic instruction reference using the following listed conventions.
Table Read Operations
Table conventions:
Data storage is normally implemented by using registers. However, when working with large amounts of
fixed data, the volume involved often makes it inconvenient to store the fixed data in the Data Memory. To overcome this problem, Holtek microcontrollers allow an
area of Program Memory to be setup as a table where
data can be directly stored. A set of easy to use instructions provides the means by which this fixed data can be
referenced and retrieved from the Program Memory.
Mnemonic
x: Bits immediate data
m: Data Memory address
A: Accumulator
i: 0~7 number of bits
addr: Program memory address
Description
Cycles
Flag Affected
1
1Note
1
1
1Note
1
1
1Note
1
1Note
1Note
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
C
1
1
1
1Note
1Note
1Note
1
1
1
1Note
1
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
1
1Note
1
1Note
Z
Z
Z
Z
Arithmetic
ADD A,[m]
ADDM A,[m]
ADD A,x
ADC A,[m]
ADCM A,[m]
SUB A,x
SUB A,[m]
SUBM A,[m]
SBC A,[m]
SBCM A,[m]
DAA [m]
Add Data Memory to ACC
Add ACC to Data Memory
Add immediate data to ACC
Add Data Memory to ACC with Carry
Add ACC to Data memory with Carry
Subtract immediate data from the ACC
Subtract Data Memory from ACC
Subtract Data Memory from ACC with result in Data Memory
Subtract Data Memory from ACC with Carry
Subtract Data Memory from ACC with Carry, result in Data Memory
Decimal adjust ACC for Addition with result in Data Memory
Logic Operation
AND A,[m]
OR A,[m]
XOR A,[m]
ANDM A,[m]
ORM A,[m]
XORM A,[m]
AND A,x
OR A,x
XOR A,x
CPL [m]
CPLA [m]
Logical AND Data Memory to ACC
Logical OR Data Memory to ACC
Logical XOR Data Memory to ACC
Logical AND ACC to Data Memory
Logical OR ACC to Data Memory
Logical XOR ACC to Data Memory
Logical AND immediate Data to ACC
Logical OR immediate Data to ACC
Logical XOR immediate Data to ACC
Complement Data Memory
Complement Data Memory with result in ACC
Increment & Decrement
INCA [m]
INC [m]
DECA [m]
DEC [m]
Rev. 2.30
Increment Data Memory with result in ACC
Increment Data Memory
Decrement Data Memory with result in ACC
Decrement Data Memory
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HT82K94E/HT82K94A
Mnemonic
Description
Cycles
Flag Affected
Rotate Data Memory right with result in ACC
Rotate Data Memory right
Rotate Data Memory right through Carry with result in ACC
Rotate Data Memory right through Carry
Rotate Data Memory left with result in ACC
Rotate Data Memory left
Rotate Data Memory left through Carry with result in ACC
Rotate Data Memory left through Carry
1
1Note
1
1Note
1
1Note
1
1Note
None
None
C
C
None
None
C
C
Move Data Memory to ACC
Move ACC to Data Memory
Move immediate data to ACC
1
1Note
1
None
None
None
Clear bit of Data Memory
Set bit of Data Memory
1Note
1Note
None
None
Jump unconditionally
Skip if Data Memory is zero
Skip if Data Memory is zero with data movement to ACC
Skip if bit i of Data Memory is zero
Skip if bit i of Data Memory is not zero
Skip if increment Data Memory is zero
Skip if decrement Data Memory is zero
Skip if increment Data Memory is zero with result in ACC
Skip if decrement Data Memory is zero with result in ACC
Subroutine call
Return from subroutine
Return from subroutine and load immediate data to ACC
Return from interrupt
2
1Note
1note
1Note
1Note
1Note
1Note
1Note
1Note
2
2
2
2
None
None
None
None
None
None
None
None
None
None
None
None
None
Read table (current page) to TBLH and Data Memory
Read table (last page) to TBLH and Data Memory
2Note
2Note
None
None
No operation
Clear Data Memory
Set Data Memory
Clear Watchdog Timer
Pre-clear Watchdog Timer
Pre-clear Watchdog Timer
Swap nibbles of Data Memory
Swap nibbles of Data Memory with result in ACC
Enter power down mode
1
1Note
1Note
1
1
1
1Note
1
1
None
None
None
TO, PDF
TO, PDF
TO, PDF
None
None
TO, PDF
Rotate
RRA [m]
RR [m]
RRCA [m]
RRC [m]
RLA [m]
RL [m]
RLCA [m]
RLC [m]
Data Move
MOV A,[m]
MOV [m],A
MOV A,x
Bit Operation
CLR [m].i
SET [m].i
Branch
JMP addr
SZ [m]
SZA [m]
SZ [m].i
SNZ [m].i
SIZ [m]
SDZ [m]
SIZA [m]
SDZA [m]
CALL addr
RET
RET A,x
RETI
Table Read
TABRDC [m]
TABRDL [m]
Miscellaneous
NOP
CLR [m]
SET [m]
CLR WDT
CLR WDT1
CLR WDT2
SWAP [m]
SWAPA [m]
HALT
Note:
1. For skip instructions, if the result of the comparison involves a skip then two cycles are required,
if no skip takes place only one cycle is required.
2. Any instruction which changes the contents of the PCL will also require 2 cycles for execution.
3. For the ²CLR WDT1² and ²CLR WDT2² instructions the TO and PDF flags may be affected by
the execution status. The TO and PDF flags are cleared after both ²CLR WDT1² and
²CLR WDT2² instructions are consecutively executed. Otherwise the TO and PDF flags
remain unchanged.
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HT82K94E/HT82K94A
Instruction Definition
ADC A,[m]
Add Data Memory to ACC with Carry
Description
The contents of the specified Data Memory, Accumulator and the carry flag are added. The
result is stored in the Accumulator.
Operation
ACC ¬ ACC + [m] + C
Affected flag(s)
OV, Z, AC, C
ADCM A,[m]
Add ACC to Data Memory with Carry
Description
The contents of the specified Data Memory, Accumulator and the carry flag are added. The
result is stored in the specified Data Memory.
Operation
[m] ¬ ACC + [m] + C
Affected flag(s)
OV, Z, AC, C
ADD A,[m]
Add Data Memory to ACC
Description
The contents of the specified Data Memory and the Accumulator are added. The result is
stored in the Accumulator.
Operation
ACC ¬ ACC + [m]
Affected flag(s)
OV, Z, AC, C
ADD A,x
Add immediate data to ACC
Description
The contents of the Accumulator and the specified immediate data are added. The result is
stored in the Accumulator.
Operation
ACC ¬ ACC + x
Affected flag(s)
OV, Z, AC, C
ADDM A,[m]
Add ACC to Data Memory
Description
The contents of the specified Data Memory and the Accumulator are added. The result is
stored in the specified Data Memory.
Operation
[m] ¬ ACC + [m]
Affected flag(s)
OV, Z, AC, C
AND A,[m]
Logical AND Data Memory to ACC
Description
Data in the Accumulator and the specified Data Memory perform a bitwise logical AND operation. The result is stored in the Accumulator.
Operation
ACC ¬ ACC ²AND² [m]
Affected flag(s)
Z
AND A,x
Logical AND immediate data to ACC
Description
Data in the Accumulator and the specified immediate data perform a bitwise logical AND
operation. The result is stored in the Accumulator.
Operation
ACC ¬ ACC ²AND² x
Affected flag(s)
Z
ANDM A,[m]
Logical AND ACC to Data Memory
Description
Data in the specified Data Memory and the Accumulator perform a bitwise logical AND operation. The result is stored in the Data Memory.
Operation
[m] ¬ ACC ²AND² [m]
Affected flag(s)
Z
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HT82K94E/HT82K94A
CALL addr
Subroutine call
Description
Unconditionally calls a subroutine at the specified address. The Program Counter then increments by 1 to obtain the address of the next instruction which is then pushed onto the
stack. The specified address is then loaded and the program continues execution from this
new address. As this instruction requires an additional operation, it is a two cycle instruction.
Operation
Stack ¬ Program Counter + 1
Program Counter ¬ addr
Affected flag(s)
None
CLR [m]
Clear Data Memory
Description
Each bit of the specified Data Memory is cleared to 0.
Operation
[m] ¬ 00H
Affected flag(s)
None
CLR [m].i
Clear bit of Data Memory
Description
Bit i of the specified Data Memory is cleared to 0.
Operation
[m].i ¬ 0
Affected flag(s)
None
CLR WDT
Clear Watchdog Timer
Description
The TO, PDF flags and the WDT are all cleared.
Operation
WDT cleared
TO ¬ 0
PDF ¬ 0
Affected flag(s)
TO, PDF
CLR WDT1
Pre-clear Watchdog Timer
Description
The TO, PDF flags and the WDT are all cleared. Note that this instruction works in conjunction with CLR WDT2 and must be executed alternately with CLR WDT2 to have effect. Repetitively executing this instruction without alternately executing CLR WDT2 will have no
effect.
Operation
WDT cleared
TO ¬ 0
PDF ¬ 0
Affected flag(s)
TO, PDF
CLR WDT2
Pre-clear Watchdog Timer
Description
The TO, PDF flags and the WDT are all cleared. Note that this instruction works in conjunction with CLR WDT1 and must be executed alternately with CLR WDT1 to have effect. Repetitively executing this instruction without alternately executing CLR WDT1 will have no
effect.
Operation
WDT cleared
TO ¬ 0
PDF ¬ 0
Affected flag(s)
TO, PDF
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CPL [m]
Complement Data Memory
Description
Each bit of the specified Data Memory is logically complemented (1¢s complement). Bits
which previously contained a 1 are changed to 0 and vice versa.
Operation
[m] ¬ [m]
Affected flag(s)
Z
CPLA [m]
Complement Data Memory with result in ACC
Description
Each bit of the specified Data Memory is logically complemented (1¢s complement). Bits
which previously contained a 1 are changed to 0 and vice versa. The complemented result
is stored in the Accumulator and the contents of the Data Memory remain unchanged.
Operation
ACC ¬ [m]
Affected flag(s)
Z
DAA [m]
Decimal-Adjust ACC for addition with result in Data Memory
Description
Convert the contents of the Accumulator value to a BCD ( Binary Coded Decimal) value resulting from the previous addition of two BCD variables. If the low nibble is greater than 9 or
if AC flag is set, then a value of 6 will be added to the low nibble. Otherwise the low nibble
remains unchanged. If the high nibble is greater than 9 or if the C flag is set, then a value of
6 will be added to the high nibble. Essentially, the decimal conversion is performed by adding 00H, 06H, 60H or 66H depending on the Accumulator and flag conditions. Only the C
flag may be affected by this instruction which indicates that if the original BCD sum is
greater than 100, it allows multiple precision decimal addition.
Operation
[m] ¬ ACC + 00H or
[m] ¬ ACC + 06H or
[m] ¬ ACC + 60H or
[m] ¬ ACC + 66H
Affected flag(s)
C
DEC [m]
Decrement Data Memory
Description
Data in the specified Data Memory is decremented by 1.
Operation
[m] ¬ [m] - 1
Affected flag(s)
Z
DECA [m]
Decrement Data Memory with result in ACC
Description
Data in the specified Data Memory is decremented by 1. The result is stored in the Accumulator. The contents of the Data Memory remain unchanged.
Operation
ACC ¬ [m] - 1
Affected flag(s)
Z
HALT
Enter power down mode
Description
This instruction stops the program execution and turns off the system clock. The contents
of the Data Memory and registers are retained. The WDT and prescaler are cleared. The
power down flag PDF is set and the WDT time-out flag TO is cleared.
Operation
TO ¬ 0
PDF ¬ 1
Affected flag(s)
TO, PDF
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HT82K94E/HT82K94A
INC [m]
Increment Data Memory
Description
Data in the specified Data Memory is incremented by 1.
Operation
[m] ¬ [m] + 1
Affected flag(s)
Z
INCA [m]
Increment Data Memory with result in ACC
Description
Data in the specified Data Memory is incremented by 1. The result is stored in the Accumulator. The contents of the Data Memory remain unchanged.
Operation
ACC ¬ [m] + 1
Affected flag(s)
Z
JMP addr
Jump unconditionally
Description
The contents of the Program Counter are replaced with the specified address. Program
execution then continues from this new address. As this requires the insertion of a dummy
instruction while the new address is loaded, it is a two cycle instruction.
Operation
Program Counter ¬ addr
Affected flag(s)
None
MOV A,[m]
Move Data Memory to ACC
Description
The contents of the specified Data Memory are copied to the Accumulator.
Operation
ACC ¬ [m]
Affected flag(s)
None
MOV A,x
Move immediate data to ACC
Description
The immediate data specified is loaded into the Accumulator.
Operation
ACC ¬ x
Affected flag(s)
None
MOV [m],A
Move ACC to Data Memory
Description
The contents of the Accumulator are copied to the specified Data Memory.
Operation
[m] ¬ ACC
Affected flag(s)
None
NOP
No operation
Description
No operation is performed. Execution continues with the next instruction.
Operation
No operation
Affected flag(s)
None
OR A,[m]
Logical OR Data Memory to ACC
Description
Data in the Accumulator and the specified Data Memory perform a bitwise logical OR operation. The result is stored in the Accumulator.
Operation
ACC ¬ ACC ²OR² [m]
Affected flag(s)
Z
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OR A,x
Logical OR immediate data to ACC
Description
Data in the Accumulator and the specified immediate data perform a bitwise logical OR operation. The result is stored in the Accumulator.
Operation
ACC ¬ ACC ²OR² x
Affected flag(s)
Z
ORM A,[m]
Logical OR ACC to Data Memory
Description
Data in the specified Data Memory and the Accumulator perform a bitwise logical OR operation. The result is stored in the Data Memory.
Operation
[m] ¬ ACC ²OR² [m]
Affected flag(s)
Z
RET
Return from subroutine
Description
The Program Counter is restored from the stack. Program execution continues at the restored address.
Operation
Program Counter ¬ Stack
Affected flag(s)
None
RET A,x
Return from subroutine and load immediate data to ACC
Description
The Program Counter is restored from the stack and the Accumulator loaded with the
specified immediate data. Program execution continues at the restored address.
Operation
Program Counter ¬ Stack
ACC ¬ x
Affected flag(s)
None
RETI
Return from interrupt
Description
The Program Counter is restored from the stack and the interrupts are re-enabled by setting the EMI bit. EMI is the master interrupt global enable bit. If an interrupt was pending
when the RETI instruction is executed, the pending Interrupt routine will be processed before returning to the main program.
Operation
Program Counter ¬ Stack
EMI ¬ 1
Affected flag(s)
None
RL [m]
Rotate Data Memory left
Description
The contents of the specified Data Memory are rotated left by 1 bit with bit 7 rotated into bit
0.
Operation
[m].(i+1) ¬ [m].i; (i = 0~6)
[m].0 ¬ [m].7
Affected flag(s)
None
RLA [m]
Rotate Data Memory left with result in ACC
Description
The contents of the specified Data Memory are rotated left by 1 bit with bit 7 rotated into bit
0. The rotated result is stored in the Accumulator and the contents of the Data Memory remain unchanged.
Operation
ACC.(i+1) ¬ [m].i; (i = 0~6)
ACC.0 ¬ [m].7
Affected flag(s)
None
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HT82K94E/HT82K94A
RLC [m]
Rotate Data Memory left through Carry
Description
The contents of the specified Data Memory and the carry flag are rotated left by 1 bit. Bit 7
replaces the Carry bit and the original carry flag is rotated into bit 0.
Operation
[m].(i+1) ¬ [m].i; (i = 0~6)
[m].0 ¬ C
C ¬ [m].7
Affected flag(s)
C
RLCA [m]
Rotate Data Memory left through Carry with result in ACC
Description
Data in the specified Data Memory and the carry flag are rotated left by 1 bit. Bit 7 replaces
the Carry bit and the original carry flag is rotated into the bit 0. The rotated result is stored in
the Accumulator and the contents of the Data Memory remain unchanged.
Operation
ACC.(i+1) ¬ [m].i; (i = 0~6)
ACC.0 ¬ C
C ¬ [m].7
Affected flag(s)
C
RR [m]
Rotate Data Memory right
Description
The contents of the specified Data Memory are rotated right by 1 bit with bit 0 rotated into
bit 7.
Operation
[m].i ¬ [m].(i+1); (i = 0~6)
[m].7 ¬ [m].0
Affected flag(s)
None
RRA [m]
Rotate Data Memory right with result in ACC
Description
Data in the specified Data Memory and the carry flag are rotated right by 1 bit with bit 0 rotated into bit 7. The rotated result is stored in the Accumulator and the contents of the Data
Memory remain unchanged.
Operation
ACC.i ¬ [m].(i+1); (i = 0~6)
ACC.7 ¬ [m].0
Affected flag(s)
None
RRC [m]
Rotate Data Memory right through Carry
Description
The contents of the specified Data Memory and the carry flag are rotated right by 1 bit. Bit 0
replaces the Carry bit and the original carry flag is rotated into bit 7.
Operation
[m].i ¬ [m].(i+1); (i = 0~6)
[m].7 ¬ C
C ¬ [m].0
Affected flag(s)
C
RRCA [m]
Rotate Data Memory right through Carry with result in ACC
Description
Data in the specified Data Memory and the carry flag are rotated right by 1 bit. Bit 0 replaces the Carry bit and the original carry flag is rotated into bit 7. The rotated result is
stored in the Accumulator and the contents of the Data Memory remain unchanged.
Operation
ACC.i ¬ [m].(i+1); (i = 0~6)
ACC.7 ¬ C
C ¬ [m].0
Affected flag(s)
C
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May 18, 2012
HT82K94E/HT82K94A
SBC A,[m]
Subtract Data Memory from ACC with Carry
Description
The contents of the specified Data Memory and the complement of the carry flag are subtracted from the Accumulator. The result is stored in the Accumulator. Note that if the result
of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is positive or
zero, the C flag will be set to 1.
Operation
ACC ¬ ACC - [m] - C
Affected flag(s)
OV, Z, AC, C
SBCM A,[m]
Subtract Data Memory from ACC with Carry and result in Data Memory
Description
The contents of the specified Data Memory and the complement of the carry flag are subtracted from the Accumulator. The result is stored in the Data Memory. Note that if the result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is
positive or zero, the C flag will be set to 1.
Operation
[m] ¬ ACC - [m] - C
Affected flag(s)
OV, Z, AC, C
SDZ [m]
Skip if decrement Data Memory is 0
Description
The contents of the specified Data Memory are first decremented by 1. If the result is 0 the
following instruction is skipped. As this requires the insertion of a dummy instruction while
the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the program
proceeds with the following instruction.
Operation
[m] ¬ [m] - 1
Skip if [m] = 0
Affected flag(s)
None
SDZA [m]
Skip if decrement Data Memory is zero with result in ACC
Description
The contents of the specified Data Memory are first decremented by 1. If the result is 0, the
following instruction is skipped. The result is stored in the Accumulator but the specified
Data Memory contents remain unchanged. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not
0, the program proceeds with the following instruction.
Operation
ACC ¬ [m] - 1
Skip if ACC = 0
Affected flag(s)
None
SET [m]
Set Data Memory
Description
Each bit of the specified Data Memory is set to 1.
Operation
[m] ¬ FFH
Affected flag(s)
None
SET [m].i
Set bit of Data Memory
Description
Bit i of the specified Data Memory is set to 1.
Operation
[m].i ¬ 1
Affected flag(s)
None
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HT82K94E/HT82K94A
SIZ [m]
Skip if increment Data Memory is 0
Description
The contents of the specified Data Memory are first incremented by 1. If the result is 0, the
following instruction is skipped. As this requires the insertion of a dummy instruction while
the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the program
proceeds with the following instruction.
Operation
[m] ¬ [m] + 1
Skip if [m] = 0
Affected flag(s)
None
SIZA [m]
Skip if increment Data Memory is zero with result in ACC
Description
The contents of the specified Data Memory are first incremented by 1. If the result is 0, the
following instruction is skipped. The result is stored in the Accumulator but the specified
Data Memory contents remain unchanged. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not
0 the program proceeds with the following instruction.
Operation
ACC ¬ [m] + 1
Skip if ACC = 0
Affected flag(s)
None
SNZ [m].i
Skip if bit i of Data Memory is not 0
Description
If bit i of the specified Data Memory is not 0, the following instruction is skipped. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two
cycle instruction. If the result is 0 the program proceeds with the following instruction.
Operation
Skip if [m].i ¹ 0
Affected flag(s)
None
SUB A,[m]
Subtract Data Memory from ACC
Description
The specified Data Memory is subtracted from the contents of the Accumulator. The result
is stored in the Accumulator. Note that if the result of subtraction is negative, the C flag will
be cleared to 0, otherwise if the result is positive or zero, the C flag will be set to 1.
Operation
ACC ¬ ACC - [m]
Affected flag(s)
OV, Z, AC, C
SUBM A,[m]
Subtract Data Memory from ACC with result in Data Memory
Description
The specified Data Memory is subtracted from the contents of the Accumulator. The result
is stored in the Data Memory. Note that if the result of subtraction is negative, the C flag will
be cleared to 0, otherwise if the result is positive or zero, the C flag will be set to 1.
Operation
[m] ¬ ACC - [m]
Affected flag(s)
OV, Z, AC, C
SUB A,x
Subtract immediate data from ACC
Description
The immediate data specified by the code is subtracted from the contents of the Accumulator. The result is stored in the Accumulator. Note that if the result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is positive or zero, the C flag will
be set to 1.
Operation
ACC ¬ ACC - x
Affected flag(s)
OV, Z, AC, C
Rev. 2.30
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May 18, 2012
HT82K94E/HT82K94A
SWAP [m]
Swap nibbles of Data Memory
Description
The low-order and high-order nibbles of the specified Data Memory are interchanged.
Operation
[m].3~[m].0 « [m].7 ~ [m].4
Affected flag(s)
None
SWAPA [m]
Swap nibbles of Data Memory with result in ACC
Description
The low-order and high-order nibbles of the specified Data Memory are interchanged. The
result is stored in the Accumulator. The contents of the Data Memory remain unchanged.
Operation
ACC.3 ~ ACC.0 ¬ [m].7 ~ [m].4
ACC.7 ~ ACC.4 ¬ [m].3 ~ [m].0
Affected flag(s)
None
SZ [m]
Skip if Data Memory is 0
Description
If the contents of the specified Data Memory is 0, the following instruction is skipped. As
this requires the insertion of a dummy instruction while the next instruction is fetched, it is a
two cycle instruction. If the result is not 0 the program proceeds with the following instruction.
Operation
Skip if [m] = 0
Affected flag(s)
None
SZA [m]
Skip if Data Memory is 0 with data movement to ACC
Description
The contents of the specified Data Memory are copied to the Accumulator. If the value is
zero, the following instruction is skipped. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the
program proceeds with the following instruction.
Operation
ACC ¬ [m]
Skip if [m] = 0
Affected flag(s)
None
SZ [m].i
Skip if bit i of Data Memory is 0
Description
If bit i of the specified Data Memory is 0, the following instruction is skipped. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two
cycle instruction. If the result is not 0, the program proceeds with the following instruction.
Operation
Skip if [m].i = 0
Affected flag(s)
None
TABRDC [m]
Read table (current page) to TBLH and Data Memory
Description
The low byte of the program code (current page) addressed by the table pointer (TBLP) is
moved to the specified Data Memory and the high byte moved to TBLH.
Operation
[m] ¬ program code (low byte)
TBLH ¬ program code (high byte)
Affected flag(s)
None
TABRDL [m]
Read table (last page) to TBLH and Data Memory
Description
The low byte of the program code (last page) addressed by the table pointer (TBLP) is
moved to the specified Data Memory and the high byte moved to TBLH.
Operation
[m] ¬ program code (low byte)
TBLH ¬ program code (high byte)
Affected flag(s)
None
Rev. 2.30
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May 18, 2012
HT82K94E/HT82K94A
XOR A,[m]
Logical XOR Data Memory to ACC
Description
Data in the Accumulator and the specified Data Memory perform a bitwise logical XOR operation. The result is stored in the Accumulator.
Operation
ACC ¬ ACC ²XOR² [m]
Affected flag(s)
Z
XORM A,[m]
Logical XOR ACC to Data Memory
Description
Data in the specified Data Memory and the Accumulator perform a bitwise logical XOR operation. The result is stored in the Data Memory.
Operation
[m] ¬ ACC ²XOR² [m]
Affected flag(s)
Z
XOR A,x
Logical XOR immediate data to ACC
Description
Data in the Accumulator and the specified immediate data perform a bitwise logical XOR
operation. The result is stored in the Accumulator.
Operation
ACC ¬ ACC ²XOR² x
Affected flag(s)
Z
Rev. 2.30
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May 18, 2012
HT82K94E/HT82K94A
Package Information
Note that the package information provided here is for consultation purposes only. As this information may be updated
at regular intervals users are reminded to consult the Holtek website () for the latest version of the package information.
SAW Type 32-pin (5mm´5mm) QFN Outline Dimensions
D
D 2
2 5
3 2
2 4
b
1
E
E 2
e
1 7
8
1 6
A 1
A 3
L
9
K
A
· ASECL
Symbol
Nom.
Max.
A
0.028
¾
0.031
A1
0.000
0.001
0.002
A3
¾
0.008
¾
b
0.007
0.010
0.012
D
¾
0.197
¾
E
¾
0.197
¾
e
¾
0.020
¾
D2
0.122
¾
0.130
E2
0.122
¾
0.130
L
0.014
0.016
0.018
K
0.008
¾
¾
Symbol
Rev. 2.30
Dimensions in inch
Min.
Dimensions in mm
Min.
Nom.
Max.
A
0.70
¾
0.80
A1
0.00
0.02
0.05
A3
¾
0.20
¾
b
0.18
0.25
0.30
D
¾
5.00
¾
E
¾
5.00
¾
e
¾
0.50
¾
D2
3.10
¾
3.30
E2
3.10
¾
3.30
L
0.35
0.40
0.45
K
0.20
¾
¾
38
May 18, 2012
HT82K94E/HT82K94A
48-pin SSOP (300mil) Outline Dimensions
4 8
2 5
A
B
1
2 4
C
C '
G
H
D
E
Symbol
A
F
Dimensions in inch
Min.
Nom.
Max.
0.395
¾
0.420
B
0.291
¾
0.299
C
0.008
¾
0.012
C¢
0.613
¾
0.637
D
0.085
¾
0.099
E
¾
0.025
¾
F
0.004
¾
0.010
G
0.025
¾
0.035
H
0.004
¾
0.012
a
0°
¾
8°
Symbol
A
Rev. 2.30
a
Dimensions in mm
Min.
Nom.
Max.
10.03
¾
10.67
B
7.39
¾
7.59
C
0.20
¾
0.30
C¢
15.57
¾
16.18
D
2.16
¾
2.51
E
¾
0.64
¾
F
0.10
¾
0.25
G
0.64
¾
0.89
H
0.10
¾
0.30
a
0°
¾
8°
39
May 18, 2012
HT82K94E/HT82K94A
48-pin LQFP (7mm´7mm) Outline Dimensions
C
H
D
3 6
G
2 5
I
3 7
2 4
F
A
B
E
4 8
1 3
K
a
J
1
Symbol
Dimensions in inch
Min.
Nom.
Max.
A
0.350
¾
0.358
B
0.272
¾
0.280
C
0.350
¾
0.358
D
0.272
¾
0.280
E
¾
0.020
¾
F
¾
0.008
¾
G
0.053
¾
0.057
H
¾
¾
0.063
I
¾
0.004
¾
J
0.018
¾
0.030
K
0.004
¾
0.008
a
0°
¾
7°
Symbol
A
Rev. 2.30
1 2
Dimensions in mm
Min.
Nom.
Max.
8.90
¾
9.10
B
6.90
¾
7.10
C
8.90
¾
9.10
D
6.90
¾
7.10
E
¾
0.50
¾
F
¾
0.20
¾
G
1.35
¾
1.45
H
¾
¾
1.60
I
¾
0.10
¾
J
0.45
¾
0.75
K
0.10
¾
0.20
a
0°
¾
7°
40
May 18, 2012
HT82K94E/HT82K94A
Product Tape and Reel Specifications
Reel Dimensions
D
T 2
A
C
B
T 1
SSOP 48W
Symbol
Description
A
Reel Outer Diameter
B
Reel Inner Diameter
C
Spindle Hole Diameter
D
Key Slit Width
T1
Space Between Flange
T2
Reel Thickness
Rev. 2.30
Dimensions in mm
330.0±1.0
100.0±0.1
13.0
+0.5/-0.2
2.0±0.5
32.2
+0.3/-0.2
38.2±0.2
41
May 18, 2012
HT82K94E/HT82K94A
Carrier Tape Dimensions
P 0
D
P 1
t
E
F
W
D 1
C
B 0
K 1
P
K 2
A 0
R e e l H o le ( C ir c le )
IC
p a c k a g e p in 1 a n d th e r e e l h o le s
a r e lo c a te d o n th e s a m e s id e .
R e e l H o le ( E llip s e )
SSOP 48W
Symbol
Description
Dimensions in mm
W
Carrier Tape Width
32.0±0.3
P
Cavity Pitch
16.0±0.1
E
Perforation Position
1.75±0.10
F
Cavity to Perforation (Width Direction)
14.2±0.1
D
Perforation Diameter
D1
Cavity Hole Diameter
2 Min.
P0
Perforation Pitch
4.0±0.1
P1
Cavity to Perforation (Length Direction)
2.0±0.1
A0
Cavity Length
12.0±0.1
B0
Cavity Width
16.2±0.1
K1
Cavity Depth
2.4±0.1
K2
Cavity Depth
3.2±0.1
1.50
+0.25/-0.00
t
Carrier Tape Thickness
0.35±0.05
C
Cover Tape Width
25.5±0.1
Rev. 2.30
42
May 18, 2012
HT82K94E/HT82K94A
Holtek Semiconductor Inc. (Headquarters)
No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan
Tel: 886-3-563-1999
Fax: 886-3-563-1189
http://www.holtek.com.tw
Holtek Semiconductor Inc. (Taipei Sales Office)
4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan
Tel: 886-2-2655-7070
Fax: 886-2-2655-7373
Fax: 886-2-2655-7383 (International sales hotline)
Holtek Semiconductor (China) Inc. (Dongguan Sales Office)
Building No. 10, Xinzhu Court, (No. 1 Headquarters), 4 Cuizhu Road, Songshan Lake, Dongguan, China 523808
Tel: 86-769-2626-1300
Fax: 86-769-2626-1311
Holtek Semiconductor (USA), Inc. (North America Sales Office)
46729 Fremont Blvd., Fremont, CA 94538
Tel: 1-510-252-9880
Fax: 1-510-252-9885
http://www.holtek.com
Copyright Ó 2012 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used
solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable
without further modification, nor recommends the use of its products for application that may present a risk to human life
due to malfunction or otherwise. Holtek¢s products are not authorized for use as critical components in life support devices
or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information,
please visit our web site at http://www.holtek.com.tw.
Rev. 2.30
43
May 18, 2012
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