Header Files

io.h The file reads the microcontroller name from the MAKE file and includes automatically the specific corresponding header file. The file defines the I/O port adresses, bit names, vector adresses etc
interupt.h This file includes the interups vector names.
delay.h this file include two accurate delay functions: _delay_ms and _delay_us.
pgmspace.h This file is used to store and retrieve constants from the program memory