Microchip megaAVR interrupt facilities are defined in the
include/picolibrary/microchip/megaavr/interrupt.h/source/picolibrary/microchip/megaavr/interrupt.cc
header/source file pair.
The ::picolibrary::Microchip::megaAVR::Interrupt::Controller class implements an
interrupt controller interface for interacting with the Microchip megaAVR global interrupt
enable.
See the ::picolibrary::Interrupt::Controller_Concept
documentation for
more information.