利用ps2键盘向单片机输入数据，这样做不仅可以减少输入输出口，而且程序代码短小精悍，可以极大的提高单片机的执行效率．-Ps2 keyboard to use single-chip input data, to do so not only can reduce the input and output port, and program code dapper, you can greatly improve efficiency in the implementation of SCM.