SPI总线接口扩展与应用

在众多型号的单片机中,有许多不带SPI串行总线接口,从而限制了其对SPI总线接口器件的使用.本文介绍了SPI串行总线的特征和时序,对无SPI总线接口的单片机采用其I/O端口,通过程序控制的方法,模拟SPI串行总线接口,使其能与SPI总线接口的器件之间进行数据传送,并以串行E2PROM应用为例,介绍了模拟SPI串行总线接口的使用方法.

Extension and Application of SPI Bus Interface

In many kinds of the MCU,there are not SPI serial bus interface,thus limiting its use with SPI bus interface device.This paper introduces the SPI serial bus characteristics and timing,By using the MCU I / O port,through the program control method,simulating SPI serial bus interface,so that it can work with SPI bus interface device transfers data between,and in a serial E2PROM application as an example,introduces the simulation of SPI serial bus the use of the interface method.