AT89ISP

AT89ISP
AT89ISP Programmer Cable
Introduction
This Application Note describes the Atmel® AT89ISP cable interface; this in-system
programmer cable communicates serially with Atmel’s AT89S microcontrollers and
reprograms them in the circuit without removal. For surface-mounted devices, elimin a t i n g t h i s s t e p gr e a t l y r e d u c e s t h e p o s s i b i l i t y o f d a m a g e s c a u s e d by
inser tion/removal of delicate leads, and allows for design changes and software/parameter updates in the field.
AT89ISP Software
The Atmel Microcontroller ISP Software is the primary means for performing in-system
programming (ISP) of Atmel AT89S devices. It provides an intuitive interface for in-system programming that can be run from a personal computer. The software will run
under the Windows®9x/ME/2000/NT® operating systems. The Atmel ISP software has
a comprehensive set of features that allows a user to view, program, and erase data
from an Atmel AT89S device. A detailed Adobe® Acrobat® document describing the
features/functions of the software accompanies it.
AT89ISP
Programmer
Cable
Application
Note
AT89ISP Cable
In order to use the Atmel Microcontroller ISP Software, the user will need to have an
Atmel AT89ISP cable. The ISP cable’s pins need to be connected to an AT89S device
in the manner shown in Figure 1. 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 10pin male header in the user’s target board. A polarized 10-pin receptacle male header
is highly recommended. The pin-out shown below represents the target 10-pin male
header connector in the user's board as viewed from the top.
Figure 1. 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
NC
(MOSI) P1.5
9
10
GND
Rev. 3310A–MICRO–10/02
1
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 2. 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 2. Proper Cable Alignment
1
2
9
10
Table 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
9
MOSI
Master Out – Slave In
2, 10
GND
Common Ground
6, 7, 8
NC
No Connection
Figure 3. AT89ISP Target Board Sample Connection
Atmel AT89ISP Cable
10-pin Male
Header
User Target Board
Parallel Port
20-/40-pin
Socket
VCC
Voltage Levels
2
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 3.3V to 5.5V.
AT89ISP Programmer Cable
3310A–MICRO–10/02
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