RTC alarm vs System alarm on ARM (STM32)

3
votes

I'm learning the stm32F4. There are some confusions I can't really understand.

What's the difference between RTC alarm and original system alarm. I only know that the RTC can save more power but nothing else. Can anyone explain to me or make some example for the difference. Thanks a lot.

1
stm32alarmreal-time-clock
There should be appropriate white-papers and documentation available: I've tried to make the question slightly more generic (as it's an ARM-based microprocessor so the domains might overlap): Good luck! - user166390
There is no domain overlap this is all within the realm of the chip vendor not related to ARM. - old_timer

1 Answers

1
votes

Please take a look at this application note. This should elaborate on the functionality of a RTC and the functionality it offers.

In short: the real-time clock (RTC) embedded in STM32 microcontrollers acts as an independent BCD timer/ counter. The RTC can be used to provide a full-featured calendar, alarm, periodic wakeup unit, digital calibration, synchronization, time stamp, and advanced tamper detection.

A RTC can also be more precise than a internal SysClk.