|The AVR processors have "fuse" bits that control options available in a particular model of the AVR processor. The default configuration can be changed by seting or clearing fuse bits in the programming process. The programming utility has a separate tab for reading and writing fuse bits.
We use the ATTiny45 as manufactured except for these two fuse modifications:
- Brown-out detection ENABLED at 1.8 V.
- 8x clock divider DISABLED so clock will be 8 MHz.