How I can distinguish, ALARM A or ALARM B waked up STM32L053 from Standby mode?

Alexey Ostrejkovsky · ‎2020-12-09

My controller can be waked up from Standby mode by Alarm A or Alarm B: Alarm A every day and Alarm B every minute. Are there any flags (or another means) to know, what event (Alarm A or B) was cause of the waking? That is the problem, because all registers (excluded PWR_CSR and RTC Backup) "dying" after MCU entering in Standby mode...

TDK · ‎2020-12-09

> Are there any flags (or another means) to know, what event (Alarm A or B) was cause of the waking?

Read the current RTC value and determine if it's consistent with an every minute or every day wakeup time.

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TDK · ‎2020-12-09

> Are there any flags (or another means) to know, what event (Alarm A or B) was cause of the waking?

Read the current RTC value and determine if it's consistent with an every minute or every day wakeup time.

If you feel a post has answered your question, please click "Accept as Solution".

Alexey Ostrejkovsky · ‎2020-12-11

Many thanks!

It looks like it will have to be done... STM32L053 has no any alarm flags, which can survive the standby mode.