topic Re: Timegap between Reset and WDT interrupt trigered time in Kinetis Microcontrollers

Timegap between Reset and WDT interrupt trigered time

udaylearns — Mon, 26 Sep 2016 13:33:48 GMT

Hi, Am unable to execute my complete WDT ISR in K20D kinetis microcontroller , System is getting reset before few instructions in WDT interrupt are executed, how to increase this limitation

Re: Timegap between Reset and WDT interrupt trigered time

Hui_Ma — Tue, 27 Sep 2016 07:59:32 GMT

Customer can add WDOG time-out value during the system initialization phase.

The WDOG register modification should within WCT (watchdog configuration time).

Wish it helps.

Have a great day,
Ma Hui
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Re: Timegap between Reset and WDT interrupt trigered time

udaylearns — Tue, 27 Sep 2016 09:46:21 GMT

Do you mean to say that maximum amount of time in Watch dog ISR is WCT , which is 128 clock cycles?

Re: Timegap between Reset and WDT interrupt trigered time

Hui_Ma — Wed, 28 Sep 2016 02:39:52 GMT

No. The WCT just watchdog configuration time. You could modify the WDOG timeout register value in code start up phase.

Then you could get enough time to execute the WDOG interrupt handle routine when WDOG interrupt happens.

Wish it helps.

Re: Timegap between Reset and WDT interrupt trigered time

udaylearns — Wed, 28 Sep 2016 06:34:26 GMT

Hi Ma Hui .

I have increased the watch dog timeout value, but i didn't find my complete Watch dog ISR executing.

Can you mention the registers to be modified?

Re: Timegap between Reset and WDT interrupt trigered time

Hui_Ma — Thu, 29 Sep 2016 05:44:08 GMT

1> Customer could modify below registers about watchdog time-out value:

Watchdog Time-out Value Register High (WDOG_TOVALH) &

Watchdog Time-out Value Register Low (WDOG_TOVALL)

2> Customer also could feed the watchdog in watchdog interrupt service routine at very beginning.

3> Customer also could modify the watchdog clock source from bus clock to LPO clock to extend the watchdog time-out time.

Wish it helps.