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Using StandBy in IAP application

Question asked by on Apr 15, 2013
For saving power I enter StandBy modeand exit it every 4s by RTC for checking GPIO. If no GPIO change I get again the StandBy mode till next time.
When I did it in 1 application it work O.K. but when I use it in main APP where there is also Boot App first I get probem. I see taht every time I enter StandBy , when I exit by the RTC it go to the BOOT reset vector and not even pass in the RTC IRQ. I check that bit nRST_STDBY is "1" mean not go to reset on StandBy.
What could be the reason?