C51/S52单片机的互锁开关程序 P2为按键输入 P1为输出,P0可接指示灯,显示是输出状态.P3.1为继电器驱动端. 还有些详细的功能,具体看代码吧..很简单-SCM C51/S52 interlocking switch procedure P2 to P1 for the output of keystrokes, P0 can be accessed by light, indicating that the output state. P3.1 client for the