此程序仍然是对Atmegal128单片机在iccavr软件下的程序，程序的主要功能是Atmegal128单片机的外部中断程序，通过按键实现外部中断功能。-This program is still in iccavr software program Atmegal128 microcontroller, the program' s main function is to Atmegal128 MCU external interrupt program, the key to achieve external interrupt function.