M PIC16F84 PIC16F84A Migration →

M PIC16F84 PIC16F84A Migration →
M
PIC16F84 → PIC16F84A Migration
DEVICE MIGRATIONS
This document is intended to describe the functional differences and the electrical specification differences that are
present when migrating from one device to the next. Table 1-1 shows the considerations that must be taken into account
when migrating from the PIC16F84 to the PIC16F84A. Table 2 shows electrical and timing differences.
Note:
This device has been designed to perform to the parameters of its data sheet. It has been tested to an electrical specification designed to determine its conformance with these parameters. Due to process differences in the manufacture of this device, this device may have different performance characteristics than its
earlier version. These differences may cause this device to perform differently in your application than the
earlier version of this device.
Note:
The user should verify that the device oscillator starts and performs as expected. Adjusting the loading
capacitor values and/or the oscillator mode may be required.
TABLE 1:
No.
1
PIC16F84 → PIC16F84A FUNCTIONAL DIFFERENCES
Module
Differences from PIC16F84
Oscillator
The PIC16F84 oscillator can run up to 10 MHz.
The PIC16F84A oscillator can run up to 20 MHz.
Legend:
H/W - Issues may exist with regard to the application circuit.
S/W - Issues may exist with regard to the user program.
H/W
S/W
Yes
Yes
OSCILLATOR
The PIC16F84A can use crystals up to 20 MHz, resulting in double the execution speed. No changes to the code, other
than for timing concerns, are required. No changes to the configuration word are required. The crystal loading capacitors
may need to be adjusted for the higher speed crystal, but verifying oscillator operation at the same speed is already
recommended for the transition from the PIC16F84 to the PIC16F84A.
 2001 Microchip Technology Inc.
DS30072B-page 1
PIC16F84 → PIC16F84A SPECIFICATION DIFFERENCES
TABLE 2:
Param
No.
PIC16F84
Symbol
PIC16F84A
Characteristic
Units
Min
Typ†
Max
Min
Typ†
Max
Core
D001
D001A
FOSC
Eternal CLKIN Frequency (HS mode)
Oscillator Frequency (HS mode)
DC
1
—
—
10
10
DC
1
—
—
20
20
MHz
MHz
VDD
VDD
Supply Voltage (XT, RC, LP modes)
Supply Voltage (HS mode)
4.0
4.5
—
—
6.0
6.0
4.0
4.5
—
—
5.5
5.5
V
V
30
TmcL
MCLR pulse width (low)
1
—
—
2
—
—
µS
D004A
SVDD
VDD rise rate to ensure internal
Power-on Reset signal (PWRT
disabled)
N/A
N/A
N/A
TBD
—
—
V/mS
D010A
IDD
Supply current during FLASH
programming (FOSC = 4.0 MHz,
VDD = 5.5V)
—
7.3
10
—
3.0
10
mA
D013
IDD
Supply Current HS PIC16F84
mode (VDD = 5.5V) (FOSC = 10 MHz)
—
5
10
PIC16F84A
(FOSC = 20 MHz)
D021
IPD
D021A
D022
∆IWDT
VIH
Power-down current (VDD = 4.0V,
WDT disabled)
mA
—
10
20
3.0
µA
µA
Commercial
—
1.0
14
Industrial
—
1.0
16
—
1.0
Module Differential Commercial
Current Watchdog Extended
Timer
mA
N/A
N/A
N/A
—
6.0
20
µA
N/A
N/A
N/A
—
—
25
µA
D040
D040A
D041
Input High Voltage
I/O Ports
with TTL buffer (4.5V<VDD<5.5V)(1)
2.4
(VDD = Entire Range)(1) 0.48VDD
with Schmitt Trigger
0.45VDD
—
—
—
VDD
2.0
VDD 0.25VDD+0.8
0.8VDD
VDD
—
—
—
VDD
VDD
VDD
V
V
V
D042
MCLR, RA4/T0CKI OSC1 (RC mode)
0.85VDD
—
VDD
0.8VDD
—
VDD
V
D043
D043A
OSC1 (XT, HS and LP modes)
OSC1 (RC mode)
0.7VDD
N/A
—
N/A
VDD
N/A
0.7VDD
0.9VDD
—
—
VDD
VDD
V
V
TBD
—
—
—
0.1
—
V
VMIN
—
6.0
VMIN
—
5.5
V
—
10
20
—
4
8
mS
VMIN
—
6.0
VMIN
—
5.5
V
—
10
—
—
4
8
mS
D050
VHYS
Hysteresis of Schmitt Trigger inputs
EEPROM Data Memory
D121
VDRW
VDD for read/write
D122
TDEW
Erase/Write Cycle Time
FLASH Program Memory
D131
VPR
D133
TDEW
†
VDD for read
Erase/Write Cycle Time
Data in “Typ” column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are
not tested.
Note 1: The user may choose the better of the two specifications.
DS30072B-Page 2
 2001 Microchip Technology Inc.
Note the following details of the code protection feature on PICmicro® MCUs.
•
•
•
•
•
•
The PICmicro family meets the specifications contained in the Microchip Data Sheet.
Microchip believes that its family of PICmicro microcontrollers is one of the most secure products of its kind on the market today,
when used in the intended manner and under normal conditions.
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the PICmicro microcontroller in a manner outside the operating specifications contained in the data sheet.
The person doing so may be engaged in theft of intellectual property.
Microchip is willing to work with the customer who is concerned about the integrity of their code.
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable”.
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of
our product.
If you have any further questions about this matter, please contact the local sales office nearest to you.
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical components in life support systems is not authorized except with
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, PIC, PICmicro,
PICMASTER, PICSTART, PRO MATE, KEELOQ, SEEVAL,
MPLAB and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
Total Endurance, ICSP, In-Circuit Serial Programming, FilterLab,
MXDEV, microID, FlexROM, fuzzyLAB, MPASM, MPLINK,
MPLIB, PICC, PICDEM, PICDEM.net, ICEPIC, Migratable
Memory, FanSense, ECONOMONITOR, Select Mode, dsPIC,
rfPIC and microPort are trademarks of Microchip Technology
Incorporated in the U.S.A.
Serialized Quick Term Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2001, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999. The
Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs and microperipheral
products. In addition, Microchip’s quality
system for the design and manufacture of
development systems is ISO 9001 certified.
 2001 Microchip Technology Inc.
DS30072B - page 3
M
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08/01/01
DS30072B-page 4
 2001 Microchip Technology Inc.
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