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LAUNCHXL-F28379D: SPI数据发送与接收

Part Number: LAUNCHXL-F28379D


如上图所示,在进行SPIA和SPIB通信的时候,为什么SPIA向SPIB发送数据的同时会接收到一个数据,但是SPIB没有给SPIA发送数据,而且也没有启用回环模式,请问这是什么原因?