Wake up vs Alert in RTC

Nikosant03 · ‎2022-08-12

Hi, could someone explain me what is the difference between wake up and alert in RTC?

For example the UM1749 provides information about RTC Alarm functions (section 39.2.8) and wake-up functions (section 40.2.2)

When should I use the wake-up and when the alert?

Peter BENSCH · ‎2022-08-13

Well, you could use either wakeup or alarm. But an alarm has to be set again after expiring.
Good luck!
/Peter

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Peter BENSCH · ‎2022-08-12

Wakeup is intended for uniformly repeating events (e.g. wakeup every 10 seconds), while the alarm can be compared to the wake-up function of an alarm clock and is usually only triggered once.

Does it answer your question?

Regards

/Peter

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Piranha · ‎2022-08-12

The reference manual for your MCU explains it clearly.

Nikosant03 · ‎2022-08-13

Thank you a lot @Peter BENSCH for your response. In my application, I want the MCU to wake-up once per day at 12:00PM. So, should I use the wakeup instead of the alarm?

Peter BENSCH · ‎2022-08-13

Well, you could use either wakeup or alarm. But an alarm has to be set again after expiring.
Good luck!
/Peter

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Nikosant03 · ‎2022-08-16

Thank you very much @Peter BENSCH

Peter BENSCH · ‎2022-08-16

You're welcome.

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Regards

/Peter

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q3z85d41xqz036d · ‎2024-03-05

If you use mask, no need to set again your alarm, or I maybe miss something ?

q3z85d41xqz036d · ‎2024-03-05

As I am wondering same question, I'll add some informations about this subject (feel free to correct me as I am new to these subjects) :

- I think that if you use mask, you dont have to reconfigure your alarm. The callback function of your alarm can be called forever, with a few settings

- Alarm seems a bit easier to use (as you only have to provide a date/time alarm, and provide a mask if you need it). For WakeUp Timer, you should chose the clock you want to use, and do simple math with frequency/prescaler of your clock. Otherwise, if you change clock frequency, this will probably change your loop.

For my case, I only need to go in sleep mode, and exit that sleep mode to measure data only once per minute. I already did the loop with alarm, work well, but I discovered WakeUp Timer.

Do you have any advice on what to use ? Do you know others differences that we listed here ?

q3z85d41xqz036d · ‎2024-03-06

Maybe someone have more informations to share ?