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MSP430FR6043: Increased current when IO interrupt is enabled in LPM3

WONSEOB SON
Prodigy 20 points
Part Number: MSP430FR6043


When entering LPM3 GIE mode on a self-made flowmeter board, 5.2 uA is consumed. However, if you change P2IE's BIT7 to 1 and enter LPM3 GIE mode and measure, 301uA is consumed.

Can you tell me why this is and how to solve it?

Thank you.

  • +1
    Prodigy 20 points

    If the interrupt is activated before performing 'PM5CTL0 &= ~LOCKLPM5;', the interrupt flag is activated while unlocking.

    When an interrupt occurs, the UART module becomes active, causing a rapid increase in current consumption.

    Therefore, when the LPM3 GIE option is given, the UART's interrupt is activated and the UART operates, increasing current consumption.

    Thanks for your help.

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