User manual

AVR Butterfly User Guide -27
4271C–AVR–04/05
Section 4
Troubleshooting Guide
Notes: 1. See the Application Note “AVR065 LCD driver for the STK502 LCD” on how
to control the LCD-display, or the Application Note “AVR064 STK502 – A
temperature monitoring system with LCD output” Or program the applica-
tion that comes with the AVR Butterfly
Table 4-1. Troubleshooting Guide
Problem Reason Solution
Nothing is displayed on the LCD.
The LCD is not enabled in the AVR device. Check the LCD initialization.
(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
disappear
Your fingers are touching the LCD pins or
PORTD
Hold the AVR Butterfly on the edge of the
PCB, without touching the LCD pins
Serial Programming does not work
ISP cable not connected properly to the
ISP-footprint
Connect the ISP cable according to Figure
3-2
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.
Parallel programming does not work
Cables not connected properly
Please refer to Section 3.2.2 “High-voltage
Parallel Programming” for correct parallel
programming set-up.
STK500 target voltage error.
Please refer to the ATmega169 datasheet
for the Parallel Programming Voltage
limits. Adjust the target voltage on the
STK500 board accordingly.