1、　　实现单片机和PC机的串行双工通信，单片的P1口接一LCD，要求PC键盘每按“0~9”数字键能发送到单片机上，并显示在单片机接的LCD上；单片机发送一串字符串能显示在PC的屏幕上-1, and PC-MCU serial duplex communication, the P1 port received a single LCD, PC keyboard required every press " 0 9"　digital keys to send to the microcontroller, and then displayed on the LCD on the MCU　microcontroller can send a bunch of strings displayed in the PC' s screen