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How to keep date and time after shut down power in STM32F429iDisco?

Question asked by li.linda.001 on Jun 10, 2015
Latest reply on Dec 31, 2015 by li.linda.001
We want to add a cell battery to keep time and date. but in the schemaitcs, Pin 1 and Pin 6 in STM32F429iDisco for VBAT alredy connect to +3V.
What we can do?
Thanks a lot