Watchdog timer problem with low temperature

[gh_rcl]

Hi All,

On a custom board we have notice weird behaviour with the watchdog timer.

Indeed sometimes on low temperature (closer to 0°C) the board is unable to restart normally on WDT reset.

On WDT reset, the scheduler restarts during few ticks and hangs. 

Any ideas would be will be very appreciated.

Regards

[mbarg.1]

I would check my oscillators first - are all running at correct frequency?

Than I would escalate to power supplies 

An have a look at Watchdog registers

[Ozone]

As mentioned, this sounds very much like a hardware issue.
Either external clock generation (quartz), or the power supply.

I suggest to check if and where your MCU has a MCO output.
Instrument your code, and watch MCO during such low-temperature restart events.