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TMS570LC4357: MibSPI1的CS1片选没有拉低但是可以成功传输数据

Part Number: TMS570LC4357


在TMS5704357开发板做SPI实验时,用的是MIBSPI1的接口,选用CS1片选,通过示波器看CS1引脚,发现CS1并不是持续拉低的, 如下图所示:第一个信号为CS1,第二个信号为CLK,第三个信号为MIBSPI1的输出。