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how to turn off UART module?

Zhiyong Li
Prodigy 180 points
Other Parts Discussed in Thread: MSP430F6720

Hi folks,

I am working on the UART module of MSP430F6720. When I put CPU into LPM3, it seems the UART TX line stays high, this might prevent the xbee module that is connected UART from entering into complete power down mode(I don't have solid proof for this claim at this point). Assuming it is true, is there any way to also turn off UART module of MSP430 when putting CPU into LPM?

Edit: I assume I can always configure UART pins into GPIO, set them as output low when UART communication is done. But this seems quite awkward.

Thanks in advance,

ZL

  • 0
    Guru 58965 points

    UART TX line is "active low". Hence when you are not transmitting, it should stay High (inactive). If you want that line to stay Low (active) instead, you can either send "Break" or switch the pin to GPIO and drive it Low.

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