串行接口的一般概念单片机与外界进行信息交换的通信接口。

8051单片机的通信方式有两种：

 　　并行通讯：数据的各位同时发送或接收。

 　　串行通讯：数据一位一位顺序发送或接收。

-The general concept microcontroller serial interface to communicate with the outside interface information exchange. 8051 There are two ways of communication: 　parallel communication: The data you send or receive simultaneously. 　serial communication: a sequence of data sent or received one.