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MSP430F6721 LPMx.5 problems

Qin Shi
Prodigy 50 points
Other Parts Discussed in Thread: MSP430F6721

Hi,

   I'm using a MSP430F6721 during my reseach. Could anyone show me how to enter Low Power Mode 3.5 or 4.5?And how could I know whether if it enters?  I have read the user guide for many times but still cannot enter LPMx.5.  :(

With Regards. 

  • 0
    Guru 227245 points

    The basic procedure is:

    Disable everything that requires SMCLK.
    For LPM4.5, do the same for everything that uses ACLK

    Enable an interrupt source that does not depend on the disabled clocks

    Clear GIE
    Set the PMMREGOFF bit
    enter LPM3 or LPM4

    The tricky part is to properly wake up from LPMx.5 again, as you need to detect whether you are started from LPMx.5 or from a power off (check SYSRSTIV). In the fist case, the control registers of most peripherals have no effect until you clear the LOCKLPM5 bit.

    However, there has been at least one recent thread about this topic and you should use the forum search to look there.

  • 0 in reply to Jens-Michael Gross
    Prodigy 10 points

    I had the same problem, your sugestion helped me:)

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