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MSP432P401R: How to turn off unused on-chip peripherals on msp432 to save power

suraj H
Prodigy 210 points

Part Number: MSP432P401R

Hi,

I went through the TRM to understand how to send a device into ultra low power state. But, when the micro controller is operational in active mode, some of the on-chip peripherals are never used, ex. comparator, flash etc.. 

So, I want to know

1. If these peripherals will be consuming power even if they are not used.

2. How to turnoff these peripherals on msp432.. I have not found any such register or method in TRM which can turnoff/turn on a peripheral of msp432? 

Thanks

Suraj

  • 0
    TI__Guru 63181 points
    Suraj,
    (1) The power consumed by these peripherals when off is reflected in the LPM3 currents found in table 5.21 of the datasheet www.ti.com/.../msp432p401r.pdf . The current consumption of the digital peripherals can be found in Table 5.23, www.ti.com/.../msp432p401r.pdf .
    (2) For the digital peripherals they are only ‘on’ when actively using a clock. In other peripherals like the ADC, Comparator, or Reference, the control for turning on/off the peripheral is found in the peripheral
    a. Comparator: CExCTL1.CEON
    b. Analog to Digital Converter: ADC14CTL0.ADC14ON
    c. Reference: REFCTL0.REFON

    Hope that helps,
    Chris
  • 0 in reply to Chris Sterzik
    Prodigy 210 points
    Hi Chris,

    By default, if we don't explicitly configure the GPIO pins to in/out, low/high, then this pins will be in which state after powering up MSP432?

    Thanks
    Suraj

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