Hi , How does using VBAT pin as back up for RTC in STM32F407 helps even when there is internal one to maintain the RTC and it's registers ?
Posted on June 27, 2018 at 09:32I couldn't understand why external back up pin VBat is kept ? Is it necessary to add a ext. backup battery#stm32f407 #stm32f4xx #rtc-backup