说明：  PowerPC与PC微机串行通信，通过CS850实验板的SMC端口与PC微机的串行口实现UART协议异步通信。PC机通过仿真终端程序实现字符输入和输出，并可实现文件传送CS850实验板上的SMC驱动软件实现ECHO操作，将从接收端口接收到的字符通过发送端口送出
(PowerPC microprocessor and the PC serial communication, through the SMC board CS850 port and PC serial port of microcomputer realize UART asynchronous communication protocol. PC-terminal emulation program through the character input and output, and file transfer CS850 realize the SMC experiment on-board driver software realize ECHO operation, from the receiving port to receive the characters sent by sending port)