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Original question:

MSP430FR5964: After SPI communication, Pin condition

MSP430FR6879: SPI clock Pin status after SPI communication

GR
Expert 2501 points
Part Number: MSP430FR6879

Tool/software:

Hi

I think SPI data pin status after communication (not driving by eUSCI peripheral) is defined PxREN & PxOUT register.

(referenced : https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1181259/msp430fr5964-after-spi-communication-pin-condition/4448630?tisearch=e2e-sitesearch&keymatch=So%2520you%2520can%2520set%2520P1.6%2520and%2520P1.7%2520status%2520via%2520PxREN%2520%2526%2520PxOUT%2520register%252C%2520default%2520is%2520disabled.#4448630 )

Is the clock pin (UCA1CLK) same (in master mode)?

Thanks,

GR

  • 0
    TI__Expert 6030 points

    Hello GR,

    I want to confirm with whether you want to know the voltage level of SPI clock pin or you want to know how to modification the configurate of the SPI clock pin after communication.

    Best Regards,

    Janz Bai

  • +1
    Guru 91230 points

    When the pin is connected to the SPI unit, the SPI "standard" (such as it is) says that SCK is driven (all the time). If the SPI is idle, it is driven according to the clock polarity.

    If the pin is disconnected from the SPI (PSEL = 00), it's not an SPI pin any more, so it's controlled by the PxDIR/PxREN/PxOUT settings.

    [Edit: Minor correction.]

  • 0 in reply to Bruce McKenney47378
    Expert 2501 points

    Hi Janz, Bruce,

    Thanks for your supporting.

    Janz Bai said:
    I want to confirm with whether you want to know the voltage level of SPI clock pin or you want to know how to modification the configurate of the SPI clock pin after communication.

    I want to know SPI clock pin output voltage when not active communication.

    Bruce McKenney47378 said:
    If the SPI is idle, it is driven according to the clock polarity.

    Thanks for information.I underatand.

    SPI clock line level is define by clock polarity setting.

    Best regards,

    GR

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