程序功能：实现开关的检测将单片机P1口的高四位的变化状态在其低四位的二极管中显示出来。(Ps:专属于哈工大的大作业课件内附Proteus原理图)-The program features: the detection of the switching microcontroller the P1 port four changes state will show up in the low four diodes. (Ps: exclusively HIT operations coursewa