VDD supply is powered off. To retain the content of the RTC backup registers, backup SRAM, and supply the RTC when VDD is turned off, VBAT pin can be connected to an optional standby voltage supplied ...
As per the reference manual (RM0493), the software makes access to the shadow copies of the RTC registers by default to avoid synchronization issues between the RTC clock and APB clock. However, if ...
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