RTC Alarm under VBAT Conditions

[MVeen.1]

From what I understand, a STM32L433RCT3 MCU powered by VBAT pin will shutdown except for RTC and backup registers.

1. I'm wondering if the RTC Alarms can trigger during the VBAT period?

2. Will any code execute from the RTC Alarm interrupt during VBAT? Will the interrupt run when VDD is reapplied to the system?

[Uwe Bonnes · Accepted solution]

VBAT mode means there is no VDD supply. So RTC alarm in VBAT mode can not wake up CPU, as CPU is without power