说明：  说到串行通信,除了 RS232 之外,还有许多其它形式的串行通信,这里介绍 SN 的 SIO 与 EMC 的 SPI 串行通信接口.简介与示例.希望可以帮助理解更多串行通信方式.
(Speaking of serial communication, in addition to RS232, there are many other forms of serial communication, where SN introduced the SIO with EMC' s SPI serial communication interface. Introduction and examples. Hope to help them understand more serial communication.)