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TMS320F280025: Could we use 3 wire SPI without /SPISTE signal?

Aki Li
Genius 9365 points
Part Number: TMS320F280025

Customer used F280025 as the slave in their SPI communication with another MCU as master. They would like to confirm whether it is okay to use only SOMI, SIMO and SPICLK signals for SPI, and the the pin of /SPISTE was used for GPIO. Could you please help check it? Thank you.

  • 0
    TI__Guru 55700 points

    Aki,

    F280025 SPI cannot be operated in slave mode without SPISTE pin. Without SPISTE pin, SPI slave will not recognize that master is talking to it and would put the SPISOMI in high impedance state.

    If you want to save a pin consider using 3-wire slave mode which uses SPISTE, SPISOMI and SPICLK pin. Please check 3-Wire SPI Pin Configuration table in TRM.

    Regards,

    Manoj