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STM32F207 lock up in Standby

Question asked by nibbles on Sep 19, 2016
Latest reply on Sep 20, 2016 by waclawek.jan
Hi, I have some code running when on a certain condition, it goes into standby.
I have pre-configured the RTC to wake the processor after 30 seconds. Everything works as expected except if cycle the power whilst its in standby.
If i remove supply for a 1 second and re-apply, the processor is stuck in standby and the only way to get it out is to remove the supply for about 3 seconds then re-apply. 

I get that its probably due to so little current being drawn that supply does not collapse quick enough but should this crash the RTC alarm and prevent a reset?

I have tried external and internal RTC oscillator configurations  and I have tried turning on the Brown out but I can still get the processor to lock up in standby.

Other than fitting an external brownout IC is there a way to prevent these lock ups?

Thanks

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