View detail for AT89ISP Programmer Cable

View detail for AT89ISP Programmer Cable
AT89ISP Programmer Cable
1. Introduction
This application note describes the Atmel® AT89ISP cable interface. This in-system
programmer cable communicates serially with Atmel's AT89S/AT89LP microcontrollers and reprograms them in the circuit without removal. For surface-mounted devices,
eliminating this step greatly reduces the possibility of damages caused by insertion/removal of delicate leads, and allows for design changes and software/parameter
updates in the field.
AT89ISP
Programmer
Cable
2. Parallel Port Settings
For optimal operation, it is recommended that the user’s PC/laptop parallel port setting
be configured for EPP (Enhanced Parallel Port). This can be done in the BIOS screen
after a boot-up sequence.
Application
Note
For laptops without a parallel port, a USB-to-Parallel converter product such as the
one featured in the following link is recommended:
http://www.dpie.com/pcmcia/spp100.html
3. AT89ISP Software
The AT89ISP software is the primary means for performing in-system programming (ISP) of Atmel AT89S/AT89LP devices. It provides an intuitive interface for insystem programming that can be run from a personal computer. The software will run
under the Windows® 9x/ME/2000/XP, Windows NT® operating systems. The software
has a comprehensive set of features that allows a user to view, program, and erase
data from an Atmel AT89S/AT89LP device. A detailed Adobe® Acrobat® document
describing the features/functions of the software accompanies it.
4. AT89ISP Cable
In order to use the AT89ISP software, the user will need to have an Atmel AT89ISP
cable. This cable can be purchased directly from Atmel or authorized Atmel representatives. The ISP cable's pins need to be connected to an AT89S/AT89LP device in the
manner shown in Figure 5-1 on page 2. The 25-pin male connector plugs into the parallel port of the user’s personal computer. The 10-pin female IDC header plugs into a
10-pin male header in the user’s target board. A polarized 10-pin receptacle male
header is highly recommended to avoid an erroneous connector mating. The pinout
shown below represents the target 10-pin male header connector in the user's board
as viewed from the top. Please note that connection of the SS pin (P1.4) is
required for all the AT89LP (single-cycle core) derivatives, but not for the AT89S
derivatives.
3310E–MICRO–10/06
Figure 4-1.
Note:
AT89ISP Cable 10-pin Male Header Pinout
(SCK) P1.7
1
2
GND
(MISO) P1.6
3
4
VCC
RST
5
6
NC
NC
7
8
P1.4 (SS)
(MOSI) P1.5
9
10
GND
NC = Not Connected.
5. Header Dimensions
Figure 5-1 shows the receptacle male header dimensions.
Figure 5-1.
10-pin Male Header Dimensions
Top View
Side View
0.100
0.025Sq.
0.235
All dimensions are in inches.
6. Connection
The correct way to connect the female header end of the AT89ISP cable to the 10-pin receptacle
male header is to align the connector “arrow” towards pin 1, as illustrated in Figure 6-1. On the
cable casing end, make sure the connector “arrow” sits visible next to the side of the small PC
board (not away from it).
Figure 6-1.
2
Proper Cable Alignment
1
2
9
10
AT89ISP Programmer Cable
3310E–MICRO–10/06
AT89ISP Programmer Cable
Table 6-1.
Atmel AT89ISP Cable Pinout
Pin
Name
Comment
1
SCK
Serial Clock
3
MISO
Master In – Slave Out
4
VCC
Target Power Supply
5
RST
Target MCU Reset
8
SS
Slave Select
9
MOSI
Master Out – Slave In
2, 10
GND
Common Ground
6, 7
NC
No Connection
Figure 6-2.
AT89ISP Target Board Sample Connection
Atmel AT89ISP Cable
10-pin Male
Header
User Target Board
Parallel Port
20-/40-pin
Socket
VCC
7. Voltage Levels
The AT89ISP cable requires a regulated DC supply from the user target board. The cable
should operate correctly between the specified operating voltage limits. The current operating
VCC voltage range for the AT89ISP cable is 2.7V to 5.5V.
3
3310E–MICRO–10/06
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