Section 3
Troubleshooting Guide
Table 3-1. Troubleshooting Guide
Problem | Reason | Solution | |
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|
| |
| The LCD is not connected. | Attach the | |
|
| the to | |
|
| 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 | |
|
|
| |
| 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. | |
|
|
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STK502 User Guide |
Rev.
