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STM32L051 battery backup

Question asked by jogo on Dec 16, 2014
Latest reply on Dec 16, 2014 by Clive One
hi everybody,

as far as i understood the data in the RTC registers are lost after a hardware reset or the power is lost. So the next idea is to use a battery as a backup. But after reading the data sheet and reference manual i can't find a pin on the STM32L051 to connect to a battery. Can someone confirm this? Are there any other possibilities to keep the RTC data?