IO口使用，三个串口收发，双定时器的使用，串口中断、定时器中断等。
IO port to use, three serial port transceiver, dual timer, serial port interrupt, timer interruption. (2016-08-16, C51, 1378KB, 下载13次)
12c5a60s2双串口通信，能同时调用2组串口进行数据互传。
12c5a60s2 Two serial communication, can call the two groups at the same time carry out serial data to each other. (2016-05-30, C51, 1KB, 下载2次)