Avr directory reference -
file boot.h
file cpufunc.h
file eeprom.h
file fuse.h
file interrupt.h
file io.h
file lock.h
file pgmspace.h
file portpins.h
file power.h
file sfr_defs.h
file signal.h
file signature.h
file sleep.h
file version.h
file wdt.h
file xmega.h