程序功能为51单片机通过三线串口操作CH452，CH452驱动8位数码管正常显示以及显示数据的更新。51单片机通过模拟CH452串口操作时序向-The program features 51 microcontroller via a three-wire serial interface operation CH452, CH452 driver 8 digital tube display properly, and display data update. 51 single-chip C