PIC18F8621 on my board stores in memory some counters. I would like to be
able to preserve these counters even after power loss without saving it in
EPROM.

Is this possible to have two power sources on one board simultaneously?

I found round batteries which are 3.3V but I can't find 5V ones and my PIC
is 5V. Does anybody know such batteries?

 

Thank you,

Sam

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