说明：  计算机与单片机之间实现串行通信，10位异步通信，波特率1200，采用定时器1产生，实现计算机串口调试助手与单片机之间的双向通信；
(The serial communication between computer and MCU is achieved. Asynchronous communication with 10 bits and baud rate of 1200 are generated by timer 1, which realizes two-way communication between computer serial port debugging assistant and MCU.)