Fuse definitions are in atmega328p::fuse. The selected byte values for a board belong in its MCUConfig.h.

Example

#define MCU_FUSE_LOW 0x62
#define MCU_FUSE_HIGH 0xD9
#define MCU_FUSE_EXT 0xFF

These are the documented factory reference bytes, not universal settings for every board.

Fuse definitions

The library names the fields in the Low, High, and Extended bytes. For example:

Low: ckdiv8, ckout, sut1, sut0, cksel3–cksel0
High: rstdisbl, dwen, spien, wdton, eesave, bootsz1, bootsz0, bootrst
Extended: bodlevel2–bodlevel0

Fuse bits are active-low. A programmed bit reads as zero.

Keep values explicit

The configuration file should contain the actual intended byte values. Do not reconstruct them with shifts, masks, or static_cast expressions in MCUConfig.h.

This repository only defines the device's fuse fields and reference values. It does not generate programming commands, write fuses, or integrate with a programmer.