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STM32F4XX PA0 WKUP from STANDBY issue

Question asked by honestgold on Nov 21, 2016
Latest reply on Nov 21, 2016 by ForumSTM32.ForumSTM3
I am having unreliable behavior with PA0 wakeup the chip from standby. If I just did a cold power cycle, the WKUP works, after I do several cycles of
WKUP--RUN APPLICATION--GOTO STANDBY
the chip does not wakeup or respond to the PA0 pulse anymore. I suspect the chip has gone into a undefined state and I don't know how to reset it. I cannot reset the PWR module which contains the WKUP logic according the spec. 

The watchdog timer works and very reliable. 

I saw an ERRATA on this PA0 WKUP issue and it says clear the PA0 source before going to STANDBY. It is always cleared and I see good pulses on the PA0 on oscilloscope. I am using a jumper to connect the PA0 to 1.8V to wake the chip up.  



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