Atmel ATAVRBFLY Data Sheet

 4271C–AVR–04/05

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

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.