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PVall
Associate III
Feb 23, 2021 7:26 PM UTC
Solved

STM32L475 - STOP2 multiple wake up modes

I have the STM32L475 working in STOP2 wake up as WFE based on the RTC. I would now like to add in an external interrupt source (WFI). There doesn't appear to be a way to use both a WFI and a WFE as wake up. The only way I could see would be to have an external clock provide similar timing as the RTC, but that would defeat a lot of the low power benefits. Is there anyway the RTC wake up can be gated with an external signal?

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waclawek.jan
waclawek.janBest answer
Super User
Feb 23, 2021 8:28 PM UTC

External pin can generate an event, too - read the EXTI chapter in RM.

JW

2 replies

waclawek.jan
waclawek.janBest answer
Super User
Feb 23, 2021 8:28 PM UTC

External pin can generate an event, too - read the EXTI chapter in RM.

JW

PVall
PVallAuthor
Associate III
Feb 24, 2021 12:08 AM UTC

Excellent. Thanks Jan!