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MSP430F2013 SPI slave transmission issue

Gilbert Morton
Prodigy 20 points

Other Parts Discussed in Thread: MSP430F2013

I am using the MSP430F2013 USI interface in SPI slave mode. The majority of the time, it is working correctly, but I see intermittent issues where the SDO pin is only outputting GND. Even when I set the USISR register to a fixed value upon seeing the /CS go active. Does anyone have any ideas, or things that I should check?

  • 0
    Guru 227245 points

    Maybe you're too slow when reacting to CS? In slave mode, transmission starts as soon as the master begins clocking SCL. Whether you wrote something to USISR or not. If you didn't, the previous content is sent (which in case of the USI is what was received last time)

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