该程序是经过精心思考，艰苦调试，得到的关于AVR单片机TWI总线的程序，本例为访问PCF8563为例，中断程序坚实可靠，以此献给大家，渴望参加程序员联盟。-The program was carefully thought, hard to debug, get on the AVR microcontroller TWI bus program, in this case as an example to access PCF8563 interrupt program a solid and

AVR 300: Software TWI Master Interface (application note)

TWI slave for atmega AVR.

TWI master for atmega avr.