ATmega328p
Hardware definitions
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Fuse.h

Purpose: Low, High, and Extended Fuse byte fields.

Namespace: atmega328p::fuse

The header exposes masks for clock selection, startup time, CKDIV8, reset/debug behavior, boot size, and brown-out level. Fuse bits are active-low: a programmed bit reads as zero.

#include <atmega328p/Fuse.h>
namespace mcu = atmega328p;
static_assert(mcu::fuse::default_low == 0x62, "Low fuse reference");
static_assert(mcu::fuse::default_high == 0xD9, "High fuse reference");
static_assert(mcu::fuse::default_ext == 0xFF, "Extended fuse reference");
Fuse.h
Fuse byte fields and factory reference values.
atmega328p
Device-specific definitions for the ATmega328P.
Definition ADC.h:14

The values above are factory reference values. They are not automatically suitable for every board. The intended bytes for a particular board belong in its MCUConfig.h.