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msp430fr5739 pullup/pulldown condition on powerup?

cuong nguyen1
Intellectual 540 points

Hi,

If I configure a port to be either pullup/pulldown, does it save the condition on the next powerup, ie having a pullup/pulldown before the microntroller code can run through port configuration?

Thanks

Carl

  • 0
    Expert 1620 points

    No, they are not.

    Only the contends of FRAM (and BSL ROM) are preserved. The BOR will set/clear some of the system & peripheral registers. This include the REN registers.

  • 0
    Guru 227245 points

    In the users guide, the register descriptions contain the initial values and the condition under which they are initialized (PUC/POR/BOR):

    7 6 5 4 3 2 1 0
    ID1 ID0 MC1 MC0 unused TACLR TAIE TAIFG
    rw-(0) rw-(0) rw-(0) rw-(0) rw-(0) rw-(0) rw-(0) rw-(0)

    You see, that all bits in this example are read/write, and are initialized to 0 at POR (without brackets: PUC, with curly brackets: BOR)

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