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MSP430F6721: How to reduce UCSI power consumption as much as possible when it is not used?

Zhiyong Li (FT)
Expert 2450 points
Part Number: MSP430F6721

Hi,

If two pins, P1.2 and P1.3, are to be used as UART to send out some data to another module once per second. What is the best practice to reduce power consumption?

I assume we can configure P1.2 and P.13 into UART pins when the time comes, reconfigure them into GPIO output once data transmission is done. Do we need to do anything else? Like reset the underlining UCA0 module?

Please advise. Thanks.

  • 0
    Guru 88530 points

    I expect the lowest power would be with the USCI in UCSWRST.

    You should probably be a little careful with the pins, since we suppose there's something at the other end of the wires and you want to avoid bus contention. The Rx pin might do well as a bare input, and Tx as a pullup. You might get this effect by just leaving them connected to the USCI and leaving the USCI in UCSWRST.

  • 0 in reply to Bruce McKenney47378
    Expert 2450 points

    Just measured actual current draw of MSP430F6721 in LPM3 with 3 idle UART, 1 idle I2C, RTC and LCD module on also, it only amounts to 20uA. This is neglectable in the grand scheme of things. So I will leave them as they are when not used, to avoid the bus contention you mentioned.

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