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SPI in Master mode, SSN pin?

Howard Delman
Prodigy 60 points
Other Parts Discussed in Thread: CC2541

CC2541.  The user guide states "In SPI master mode, the SSN pin is not used."  Can anyone tell me if the SSN pin is unusable in master mode, or if it reverts to GPIO?

  • 0
    TI__Guru** 105180 points
    Hello Howard,

    Please see the UG:
    7.6 Peripheral I/O
    ..
    Note that a peripheral normally is present at the selected location even if it is not used, and another
    peripheral that is to use the pins must be given higher priority. The exception is the RTS and CTS pins of
    a USART in UART mode with flow control disabled and the SSN pin of a USART configured in SPI master
    mode.
    ..

    So you can assign it to another peripheral just as RTS/CTS when no flow control is used.

    Best wishes