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MSP-EXP430FR2355: issue with Watchdog timer

vamshi b
Intellectual 790 points
Part Number: MSP-EXP430FR2355
Other Parts Discussed in Thread: MSP430FR2355

Hello team,

We are working on watchdog timer for MSP430FR2355. can we modify WDT time from 32msec to user defined in Watchdog mode?

or we need to use WDT in interval mode to generate a PUC or is there any other work arround ? very thankful if you provide any suggestion through example.

  • 0
    TI__Guru 60361 points

    Hello vamshi b,

    According to the MSP430 user's guide, the WDT timeout is 32ms based on the SMCLK.  It is possible to select a different clock source and divisor to generate a different "timeout" that can be used to either generate a reset or, if configured in interval timer mode, an interrupt.

    Does this answer your question?

  • 0 in reply to Dennis Lehman
    Intellectual 790 points

    Thank you for the reply,

    I tested with the above intervals with WDTIS_5 (2^13) that too in SMCLK (1 Mhz). Now i'm getting waveform as below which is beyond my expectation. my expectation as per WDTCTL register is

    2^13/1Mhz = 8.1msec. but result is above 10msec. Am i mistaken in calculation?

    what exact calculation for different clock source behind this? any help would be very thankful.

     

  • 0 in reply to vamshi b
    TI__Guru 60361 points

    Hi vamshi,

    How are you generating the waveform in the scope plot?

    I assume you have the WDT running in interval mode and you are monitoring a GPIO pin. Do you set this pin high somewhere early in main and when the WDT timesout you clear this pin? Do you configure the system clocks first?  Can you share your code?

  • 0 in reply to Dennis Lehman
    TI__Guru 60361 points

    Hi vamshi,

    I see your other posting with code example.  I will respond to that thread.

  • 0 in reply to Dennis Lehman
    TI__Guru 60361 points

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