串行接口是一种可以将接受来自CPU的并行数据字符转换为连续的串行数据流发送出去，同时可将接受的串行数据流转换为并行的数据字符供给CPU的器件。(Serial interface is a kind of can accept parallel data from the CPU characters into a continuous flow of serial data sent, at the same time accept the serial data stream can be converted to parallel data character supply device of CPU.)