STK502 User Guide
3-1
Rev. 2528A–AVR–11/02
Section 3
Troubleshooting Guide
Table 3-1. Troubleshooting Guide
Problem
Reason
Solution
Nothing is displayed on
the LCD.
The LCD is not connected.
Attach the 34-pins cable between
the to 34-pins headers on the
STK502.
The LCD is not enabled in
the AVR device.
Check the LCD initialisation
(1)
.
The update frequency is
not correct.
Verify that the clock prescaling
correspond with the clock source
(1)
.
Some segments on the
LCD seems to be stuck
at high/low.
The PORTA/C/D and/or G
are connected to
something else than the
LCD display.
Check that nothing is connected to
these PORTS on the STK500 and
STK502.
Can’t control
PORTF[1:0]
PF[1:0] is not connected to
the ATmega169.
Set the PF[1:0] switch in the PIN-
position.
Serial Programming
does not work
ISP cable not connected.
Connect the ISP cable according to
Figure 2-6.
STK500 target voltage
error.
Please refer to the ATmega169
datasheet for the Serial
Programming Voltage limits. Adjust
the target voltage on the STK500
board accordingly.
The RSTDISBL Fuse is
programmed.
Use Parallel Programming to
unprogram the RSTDISBL Fuse.
