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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.

old_timer
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aaa SA
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  • 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! –  Nov 19 '12 at 02:30
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    There is no domain overlap this is all within the realm of the chip vendor not related to ARM. – old_timer May 14 '19 at 14:00

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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.

Tarick Welling
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