NOTE: If you are just updating the firmware, you don't need to worry about any of this.
| Fuse byte | Value | |
|---|---|---|
| Low | 0x9f | |
| High | 0xc1 | (without bootloader) |
| High | 0xc0 | (with bootloader) |
To program with avrdude use one of the following command lines:
avrdude -c <your programmer> -p atmega8 -U lfuse:w:0x9f:m -U hfuse:w:0xc1:m
avrdude -c <your programmer> -p atmega8 -U lfuse:w:0x9f:m -U hfuse:w:0xc0:m
(These settings are from the original RetroAdapter 2.1a, before the modifications done in this repository.)
| Fuse byte | Value |
|---|---|
| Low | 0xef |
| High | 0xdf |
| Extended | 0xf8 |
To program with avrdude use the following command line:
avrdude -c <your programmer> -p atmega168 -U lfuse:w:0xef:m -U hfuse:w:0xdf:m -U efuse:w:0xf8:m
Ignore warnings about the efuse not being set properly, it is a limitation of avrdude.
If you have a different microcontroller, please read the datasheet specific for your model.
You can also use a third-party tool like https://www.engbedded.com/fusecalc/ to help understanding and calculating the values for each fuse byte.