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yabool2001
yabool2001
Associate III
December 2, 2023
Solved

Exiting from STOP using RTC Alarm A

Hi,

Exiting from STOP mode based on RTC Alarm A works nice with ALRAIE (Alarm A interrupt enabled) and ALRAE (Alarm A enabled). 

Do I understand this mechanism correctly, that I've to have both bits enabled?  Having only ALRAE (Alarm A enabled) isn't enough for exit from STOP mode?

 

V/r

yabool2001

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STTwo-32
STTwo-32Best answer
ST Technical Moderator
December 2, 2023

Hello @yabool2001 

To exit from stop mode using RTC, you need to enable both ALRAE to enable Alarm A and ALRAIE to enable Alarm A interrupt. The interruption need to be enabled because the wake-up operation start when an RTC interrupt  occur.

Screenshot_2023-12-02-10-46-43-25_e2d5b3f32b79de1d45acd1fad96fbb0f.jpg

For more details, you Can take a look at the RTC chapter of the reference manual of your MCU.

Best Regards.

STTwo-32 

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
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2 replies

STTwo-32
STTwo-32Best answer
ST Technical Moderator
December 2, 2023

Hello @yabool2001 

To exit from stop mode using RTC, you need to enable both ALRAE to enable Alarm A and ALRAIE to enable Alarm A interrupt. The interruption need to be enabled because the wake-up operation start when an RTC interrupt  occur.

Screenshot_2023-12-02-10-46-43-25_e2d5b3f32b79de1d45acd1fad96fbb0f.jpg

For more details, you Can take a look at the RTC chapter of the reference manual of your MCU.

Best Regards.

STTwo-32 

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
    yabool2001
    yabool2001Author
    Associate III
    December 2, 2023

    @STTwo-32 thx for confirmation and explanation.

     

    V/r

    @yabool2001 

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