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STM32F407 Standby issues

Question asked by engelbrecht.pirow on Oct 24, 2012
Latest reply on Apr 22, 2013 by Amel N

We've managed to get our STM32F407 board to cycle in and out of standby using the RTC (once a second). We've also enabled the wake-up line to allow another low power micro to wake it up if needed.

The problem we have at the moment, however, is that if the wake-up line is asserted just before the STM32 goes into standby the STM32 hangs, i.e. the RTC fails to wake-up the STM32 and the board needs to be power cycled before returning to normal.

I've checked the errata sheet - but standby mode is not mentioned. 

Has anyone encountered a similar problem? Any ideas?