MCS51系列、MCS96系列等单片机由于都不带SPI串行总线接口而限制了其在SPI总线接口器件的使用。文中介绍了SPI串行总线的特征和时序，并以串行E2PRO...

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MCS51系列、MCS96系列等单片机由于都不带SPI串行总线接口而限制了其在SPI总线接口器件的使用。文中介绍了SPI串行总线的特征和时序，并以串行E2PROM为例，给出了在51系列单片机上利用I/O口线实现SPI串行总线接口的方法和软件设计程序-MCS51 series, MCS96 series Singlechip not take as a result of SPI serial bus interface and limit its SPI bus interface device in use. In this paper, the characteristics of SPI serial bus and timing, and serial E2PROM for example, are given in 51 series single-chip using the I/O port lines to achieve SPI serial bus interface and software design process