SPI总线及其在单片机系统中的应用

SPI Bus and its Application in Single Chip Microcomputer System

目前,MCS-51系列单片机的应用很广,但它们自身没有SPI串行总线接口,这就限制了带SPI总线接口的器件在这些系统中的应用。本文详细介绍了SPI总线的性能,并运用软件模拟SPI总线时序的方法,实现MCS-51系列单片机的SPI通信。

At present,single chip microcomputer of MCSSI series were applied widely,but they have no interface for SPI bus,so the device for SPI bus interface in these system was limited.This paper gives a deailed introduction about the feature of SPI bus,and shows the solution for the communication between MCS-51 and other SPI devices by using software to simulate the SPI bus time sequence.