SPI（Serial Peripheral Interface）是一种串行同步通讯协议，由一个主设备和一个或多个从设备组成，主设备启动一个与从设备的同步通讯，从而完成数据的交换。SPI 接口由SDI（串行数据输入），SDO（串行数据输出），SCK（串行移位时钟），CS（从使能信号）四种信号构成，CS 决定了唯一的与主设备通信的从设备，如没有CS 信号，则只能存在一个从设备，主设备通过产生移位时钟来发起通讯。通讯时，数据由SDO 输出，SDI 输入，数据在时钟的上升或下降沿由SDO 输出，在紧接着的下降或上升沿由SDI 读入，这样经过8/16 次时钟的改变，完成8/16 位数据的传输。

1602\102.lis
....\102.o
....\102.s
....\102._c
....\1602.c
....\1602.cof
....\1602.dbg
....\1602.hex
....\1602.lis
....\1602.lk
....\1602.lst
....\1602.mak
....\1602.mp
....\1602.o
....\1602.prj
....\1602.s
....\1602.SRC
....\1602._c
1602

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