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Wake up from Standby mode

Question asked by Beginner on Aug 6, 2013
I am using STM32L151VBT6 controller. The problem which i am  facing is only one wake up source can wake up my MCU from Standby mode, that is either RTC alarm or wake up pin. if i used the both sources, only wake up pin can wake up the MCU from the standby mode please help me in this regard.
/* Configure the Power Good line interrupt as a wakeup source */
   PWR_WakeUpPinCmd(PWR_WakeUpPin_1, ENABLE);
   RTC_Set_Alarm();//wake up every 15 minutes

thank you.