I am working on this clock project using M48.
How do I update my time when I have complete power loss?(i.e.no batteries, no supercaps)
Do I have to use a GPS module to sync up with the new time when power comes back on? EEPROM won't work because there is no way to predict how long the batteries/power will have gone before they are replaced.
I don't have a real time clock IC right now and I want to keep it that way. The M48 only is doing this job.