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Determining Cause of Reset

Ben Walpole
Intellectual 790 points

Other Parts Discussed in Thread: MSP430F168

Hi,

I'm writing code for an MSP430F168.

Are there status bits that can be inspected on start-up to determine why we have reset i.e. POR, BOR, watchdog timeout etc?

Thanks,

Ben

 

 

 

  • 0
    Expert 1235 points

    Hi Ben,

    MSP430 has a POR(Power on Reset) and PUC(Power Up clear) which is mentioned in Chapter-2 of the msp430x1xx user guide. A Watchdog timer does a PUC and it can be detected using the WDTIFG flag in IFG1. This flag is cleared by a POR and not by a PUC(which the Watchdog generates). Therefore after a reset if software finds WDTIFG set it means that watch dog generated the reset. Since BOR does a POR differentiating between the two may not be possible. However MSP430F168 also has supply voltage supervisor which can be used to check the supply. SVS has a flag SVSFG which is reset only by BOR (and not POR or PUC).

    Regards,

    Praval

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