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PWR_ClearFlag(PWR_FLAG_SB) not work

Question asked by strauss.bar on Sep 23, 2014
Latest reply on Sep 23, 2014 by Amel N
Hi.
I am using the STM32F205ZC and I try to clear the StandBy flag by this command.PWR_ClearFlag(PWR_FLAG_SB). But it doesn't work. I try manual to go to PWR_CR->CSBF and clear there but no help.
Only when I active before RCC_ClearFlag(); It work.
I allow access to the PWR by this command
  PWR_BackupAccessCmd(ENABLE);
Why it doesn't work by its own?
Thanks
Bar.

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