STM32U5A Wake-UP from stop mode 3
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2024-02-09 11:38 AM
Hello all,
I am using the STM32U5A5QJ in a project and I had a question about some of the wake-up modes. I would like the microcontroller to be in stop mode 3 most of the time until it receives an interrupt from a sensor to return to normal mode. The data sheet seems to specify two ways of doing this and I’m wondering which is correct or if both can be used.
- In Table 9. STM32U5Axxx modes overview it says the wake-up source for stop mode 3 is one of the 24 WKUPx I/O’s.
- There is also a section under Extended interrupt/event controller (EXTI) where it says “The EXTI wake-up requests allow the system to be woken up from Stop modes.”
They both seem to say that they can be used to wake-up from stop mode, is this correct or should one be used over the other?
Thanks for your help,
Solved! Go to Solution.
- Labels:
-
GPIO-EXTI
-
Interrupt
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Power
-
STM32U5 series
Accepted Solutions
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2024-02-09 12:01 PM
Helll @bjackson96 and welcome to the ST COMMUNITY :smiling_face_with_smiling_eyes:.
According to the RM0456, you can exit the STOP 3 mode using WKUPx pin edge, RTC/TAMP event/interrupt, NRST pin external reset, IWDG reset, BOR reset.
Best Regards.
STTwo-32
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2024-02-09 12:01 PM
Helll @bjackson96 and welcome to the ST COMMUNITY :smiling_face_with_smiling_eyes:.
According to the RM0456, you can exit the STOP 3 mode using WKUPx pin edge, RTC/TAMP event/interrupt, NRST pin external reset, IWDG reset, BOR reset.
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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2024-02-09 12:11 PM
Thank you so much for getting back to me so quickly!
Thanks for the clarification.
