STM32CubeMX 5.6.1 , Atollic TrueStudio 9.3.0 , MCU is a STM32L053 with VDD wired to a coin cell. LSE is connected to a watch crystal.The RTC works fine. Going into standby mode works fine. Waking up from standby mode works fine. Checking and resettin...

The datasheet says that shutdown mode while RTC is running (via external crystal, aka LSE) is definitely available. I need to wake up at exactly midnight once per day, hopefully for several years.If I understand correctly, the shutdown mode allows wa...