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TMS320F28232: F28323 McBSP as SPI slave in multi-slave environment

Jon Warriner1
Prodigy 30 points
Part Number: TMS320F28232

I have an SPI bus consisting of one master and two slaves.  One of the slaves is an F28232 using McBSP in SPI slave mode.  On that particular slave, can I exclusively use SPISTEn (FSX) to select the device?  When that device is not selected, and we are talking to the other slave, will it care that the clock is toggling while its SPISTEn (FSX) is not asserted?

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    TI__Mastermind 29251 points

    Hi Jon,

    Jon Warriner1 said:
    On that particular slave, can I exclusively use SPISTEn (FSX) to select the device? 

    Yes, this will work.

    Jon Warriner1 said:
    When that device is not selected, and we are talking to the other slave, will it care that the clock is toggling while its SPISTEn (FSX) is not asserted?

    The McBSP will ignore activity on the SPI bus when its SPISTEn is not selected. Note the FSX to DX valid and invalid timings in the datasheet to avoid issues with multiple slaves driving the SOMI pin.