Atmel STK502 manual Section Troubleshooting Guide

Section 3

Troubleshooting Guide

Table 3-1.Troubleshooting Guide

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

STK502 User Guide 3-1

Rev. 2528A–AVR–11/02