用于实现单片机16F648A和微控制器的通信。通过回车来确定通信是否成功，成功了可以从对应的LED开关看出，同时电脑终端会出现正确或错误的回复-This program is designed to convert 16F648A into a working micro-controller system which waits for one of a number of　Carriage Return　terminated messages and turn on or turn off one of four LEDs corresponding to the message. If the message is decoded successfully, an　OK　will be sent to the PC, otherwise an　Error message will be returned