I'm using RTC unit in the BF512 processor in my own application. The supply voltage of RTC unic is backed up by capacitor to enable RTC unit working several hours after the main power supply of my unit is switched-off.
Is there any way how to detect that the RTC unit was reset because of low capacitor voltage and the RTC registers values (counters) are not valid? I need to know the RTC date/time is or isn't valid after my BF512 program starts running.
Thank you for your answers.