Purpose: Pin capabilities and alternate function identifiers.

Namespace: atmega2560::pin.

Flags describe capabilities of logical MCU pins, not Arduino board pin numbers. The external memory interface shares PA/PC/PG signals, and JTAG shares PF4..PF7.

#include <atmega2560/PinFunctions.h>
 
namespace mcu = atmega2560;
 
static_assert(mcu::pin::capabilities::PB0 != 0, "ATmega2560 PinFunctions definition");

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

Source: ATmega2560 datasheet (DS40002211A).