S32K146 watchdog timeout

[yqs77]

Hi,

I want to enable a watchdog with 10 minutes timeout on S32K146, and I have noticed that when CS[PRES] is set, the clock source is prescaled by 256 before clocking the watchdog counter which allows for longer timeout periods. But I am still wondering whether the watchdog timeout can be set to 10 minutes. If cannot, what is the maximum timeout? Thanks a lot!

[Robin_Shen · Accepted solution]

Hi

WDOG has a programmable16-bit timeout counter. And the clock can be selected by WDOG_CS[CLK] and SIM_LPOCLKS[LPOCLKSEL]. If fixed 256 clock prescaler is enabled, then it's able to achieve 10 minutes timeout.

Table 27-9. Peripheral module clocking WDOG.png

SIM_LPOCLKS[LPOCLKSEL].png

Best Regards,
Robin
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[yqs77]

Thank you very much for the reply, that helps a lot!