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March 13, 2026
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A Timer triggering RTC Timestamp periodically ? (is it possible ?)

  • March 13, 2026
  • 1 reply
  • 143 views

I'd like to use a general purpose timer to continuously trigger a rtc timestamp (using H533)

Is it possible ?

How to map TRGO signal to Timestamp trigger ?

(No HAL please, LL or direct register setup).

Thanks in advance.

Best answer by mƎALLEm

Hello,

It's not possible to directly use a general purpose timer to continuously trigger an RTC timestamp event through internal routing. The RTC timestamp can only be triggered by an event on the timestamp pin, a tamper event, or a switch to VBAT mode. If you require timer-based triggering, you may need to externally connect a timer output to the RTC timestamp pin.

From DS14539:

screenshot.png.

1 reply

mƎALLEm
mƎALLEmBest answer
Technical Moderator
March 16, 2026

Hello,

It's not possible to directly use a general purpose timer to continuously trigger an RTC timestamp event through internal routing. The RTC timestamp can only be triggered by an event on the timestamp pin, a tamper event, or a switch to VBAT mode. If you require timer-based triggering, you may need to externally connect a timer output to the RTC timestamp pin.

From DS14539:

screenshot.png.

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