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STM32L152 rtc battery

Question asked by Drescher.Peter on Oct 3, 2014
Latest reply on Oct 3, 2014 by Clive One
The STM32L152 is working. Also the external 32KHz is driving the rtc. If I connect a battery to VBAT pin the oscillator stops working if main power go down. There is also no current from battery to VBAT. In running mode there are some µA.

Is there a config bit to switch on the battery power ?