STM32L476VGT6 - RTC - Time after Reset

mejrissi · ‎2016-09-15

Posted on September 15, 2016 at 15:58

Hi guys,

The project that I am doing needs the RTC clock to be working all the time.

When VDD = 0V I have VBat powering the RTC. When the MCU reboots, I need to know if the time indicated by the RTC is correct, or if the time indicated by the RTC is wrong (eventually because of a drop in VBat).

Is there a way to detect if the RTC is showing the right time after a reset?

I am working with a STM32L476VGT6 MCU.

Thanks in advance for your time.

#rtc #stm32l4 #vbat

waclawek.jan · ‎2016-09-15

Posted on September 15, 2016 at 17:09

Measure the battery voltage upon poweron. If it is below the voltage guaranteed to run the RTC, consider time as unreliable or outright wrong.

JW

mejrissi · ‎2016-09-15

Posted on September 15, 2016 at 17:50

Thank you very much for answering my question waclawek.jan. This will do the trick.