Hello, I am using STM32F407ZGT6 and have the issue with time of RTC peripheral which resets to initial value after power down the board while VBAT pin is connected to CR1220 battery and LSE is used as crystal. How can I solve it?

[waclawek.jan]

VREF+ can be supplied from the reference. It does not need to be tied to VDDA, as long as VREF+ > VDDA - 1.2V.

JW

[Aasda.3]

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