Hardware Description
3-2 AVR
®
In System Programmer User Guide
failed. If programming fails, check the “Troubleshooting Guide” on page Table 7-1. Dur-
ing start-up the status LED cycles through red, yellow to green to indicate that the
master MCU is ready.
3.1.3 ISP Interface Cables AVRISP supports both the 6-pin header connector pinout, used by the Atmel AT90ISP
cable, and the 10-pin header connector used by the STK200 and STK300 development
boards. Figure 3-2 shows the pinouts for the 6-pin and 10-pin ISP connectors.
AVRISP is delivered with one 6-wire and one 10-wire ISP cable. Use the one that match
the pinout of the target ISP connector. However, note that only one cable should be con-
nected, and used, at any given time. By default the 10-pin header connector is mounted.
Figure 3-2. AVRISP Connectors (Top View)
3.2 AVRISP Power
Requirements
and
Considerations
Since the AVRISP draws power from the target, it is important that the target board is
able to provide enough power to ensure correct operation. The AVRISP will draw maxi-
mum 50 mA @ 5.5V. The current is drawn through the VTG line. The target should thus
be able to supply at least this amount of power in addition to the requirements of the tar-
get board itself.
See “Technical Spesification” section on page 8-1 for information on power
consumption.
The AVRISP is not equipped with a power switch. Power is turned on when AVRISP is
connected to the target application and turned off when disconnected.
3.3 Connecting
AVRISP to Target
Board
The AVRISP connects to the target board through a 3 x 2 or 5 x 2 male header connec-
tor with 2.54 mm (0.1”) spacing (Figure 3-3). If there is a 6-pin or 10-pin ISP connector
on the target board, the cable on the AVRISP has to be changed accordingly.
The power of the target board should be turned off when connecting or disconnecting
the header connector. Hot-swapping is not supported and might damage the
programmer.
Table 3-2. VRISP Connector pinout
Signal 6-Pin 10-Pin I/O Description
VTG 2 2 – Power is delivered from the target board
GND 6 3,4,6, 8,10 – Ground
MOSI 4 1 Output Commands and data from AVRISP to target AVR
MISO 1 9 Input Data from target AVR to AVRISP
SCK 3 7 Output Serial Clock, Controlled by AVRISP
RESET 5 5 Output Reset. Controlled by AVRISP
MISO
SCK
RST
VTG
MOSI
GND
ISP6PIN
MOSI
MISO
RST
VTG
GND
ISP10PIN
GND
GND
GND
SCK
GND
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