I am using STM32L443 processor. When the processor is locked, I reset the processor with NRST with external wdg. The processor is not reset although WDG is working properly.

[OŞeno.1]

I checked WDG. The system is working properly. If there is no reset, it resets when I disable the WDG signal. In case of deadlock, I pull to GND myself, but it still does not reset. The only solution is to cut off all energy.

[MLint.1]

I have a similar problem with an STM32L5.

I have the IWDG set up to fire 4 seconds if no HAL_IWDG_Refresh(&hiwdg) is executed.

Very occasionally, a lockup condition occurs.

But the STM32 does not reset.

Moreover, grounding the nRST pin does not reset the STM32

Scoping the nRST pin, i can clearly see the IWDG pulsing the pin, But the STM32 does not reset.

Only a power cycle resets..

nSRT pin is connected to a 100n cap, nothing else, as per the manual.

Did you ever find a solution?

[OŞeno.1]

Sorry, I still haven't found anything clear. But upon the information I received, I was told to define the idle pins as outputs, I will try.

[S.Ma]

Anything in the errata sheet? The chip is in clock stopped mode?

[OŞeno.1]

I couldn't find any relevant information.