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skoe · 2022-12-13

We are using an STM32WL55 (NUCLEO-WL55JC2) and don't understand RCC_BDCR_RTCEN. Our system is configured to be woken up from Stop 1 Mode via RTC wake-up, clocked by LSE. This works, but we wonder about a detail.According to RM0453, RCC_BDCR_RTCEN is ...

skoe · 2022-09-12

We noticed that our TIM2 did not count after our STM32L152 went to Stop Mode and woke up again.When we analyzed the problem, we found that our debug probe set DBGMCU to DBG_STANDBY | DBG_STOP | DBG_SLEEP. When we power cycled the µC or set DBGMCU to ...

skoe · 2016-04-27

Posted on April 27, 2016 at 10:16RM0038 says (5.1.6) that one has to wait for VOSF (Voltage Scaling select flag) when changing the voltage range using VOS. The same page contains a note that says that ''the system clock is stopped until the regulato...

skoe · 2015-10-22

Posted on October 22, 2015 at 21:54The STML0 (and L1) manual says following about the register EXTI_PR: ''1: The selected trigger request occurred. This bit is set when the selected edge event arrives on the interrupt line. This bit is cleared by wr...

skoe · 2022-12-15

Indeed interesting. And thank you for thinking about this, @Community member !I put a small loop into the code which prints the following over UART (the timestamps are from minicom):[2022-12-15 12:04:00.207] RCC_BDCR: 0x00000103 ... [2022-12-15 12:0...

skoe · 2022-12-13

Thanks for the response, @Community member. It is indeed not set, it says RCC.BDCR: 0x00000103, but the LED we put there as an indicator blinks exactly at the right speed and there's no other wake-up source that could do this.We are still wanting to...

skoe · 2022-09-12

Thank you both for the responses. Yes, we are aware of the primary meaning of DBG_STOP, leaving an internal oscillator active to allow debug access during Stop Mode.I forgot to mention one experiment we made which may clarify the question: When we do...

skoe · 2015-10-22

Posted on October 22, 2015 at 23:43> In first case: EXTI->PR |= EXTI_PR_PR20; you mask only that bit and write 1 to it. > That would clear it. Thanks for your response but unfortunately I think that's not correct. That's an ''or'', not an ''and''. L...

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What does RCC_BDCR_RTCEN do on an STM32WL55?

Why does RCC_APB1ENR:TIM2_EN get cleared in Stop Mode when DBGMCU is set?

VOSF bit confusion

EXTI->PR Manual vs Snippets

Re: What does RCC_BDCR_RTCEN do on an STM32WL55?

Re: What does RCC_BDCR_RTCEN do on an STM32WL55?

Re: Why does RCC_APB1ENR:TIM2_EN get cleared in Stop Mode when DBGMCU is set?

Re: EXTI->PR Manual vs Snippets