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Increase Watchdog trip speed in TMS320F28022?

Andrew Dai
Prodigy 70 points

Other Parts Discussed in Thread: TMS320F28022

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  • 0
    TI__Guru* 93450 points

    Andrew Dai said:

    Hi,

    Is there any way to speed up a watchdog counter in a TMS320F28022 that is being run off the internal oscillator, without requiring an external oscillator?  Currently, my watchdog is clocked off the 10MHz internal oscillator, but the watchdog trip time is about 13 ms.  I would like to get that time down to <10 ms.  Is there a way I can clock the watchdog off of sysclkout?  Or change the counter register so that the watchdog starts counting from halfway, rather than through the entire range?

     

    Thank you!

    Hi Andrew,

    The watchdog is always fed from OSCCLK (refer to the CPU block diagram section 3.4 in www.ti.com/lit/sprufn3).  There is a prescaler in the WDCR register you can change to modify the rate, but unfortunatly that will take you in the opposite direction from where you want to go. 

    -Lori