Purpose: Core register and status flags.

Namespace: atmega2560::cpu.

#include <atmega2560/CPU.h>
 
namespace mcu = atmega2560;
 
static_assert(static_cast<unsigned>(mcu::cpu::StatusFlag::GlobalInterrupt) == 7, "ATmega2560 CPU definition");

These are hardware definitions, not runtime register access or initialization.

Source: ATmega2560 datasheet (DS40002211A).