基于雨亭的51/AVR单片机开发板的按键扫描程序，在定时器中断中定时扫描，使用状态机进行按键去抖，与延时扫描相比效率较高，占用资源少-Yu Ting s 51/AVR microcontroller based development board scanner button, the timer interrupt in time scan, using the state machine button to shake, as compared with the delayed scan m