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STM32F Standby PowerManagement

Question asked by Mio001 on Feb 9, 2014
Latest reply on Feb 10, 2014 by Clive One
in my project a 2.8V voltage regulator is connected to the VDD pins of the STM32Fxx device. VBat is directly connected to a 3V battery.
After reset the mcu processes some tasks and after that the controller falls into a "deep sleep" (Standby Mode). But before i want to disable the 2.8V voltage regulator by the PC13 pin.
How can i reactivate the regulator when the mcu wakes up from the standby mode (by RTC alarm after some seconds)?
What happend when the mcu wakes up and there is no VDD power supply available because the voltage regulator is still disabled?