Oscillator set up for low power PIC

Thread Starter


Joined Aug 30, 2011
Hi everybody,
I don't understand because my pic doesn't work at low voltage (3V).
Data sheet of PIC16LF876A say that supply voltage can range from 2.0 to 5.0 V for all configurations.
I set up all ports as output, cleared all bits and selected LP as oscillator mode.
The crystal used is a 32,768 KHz crystal watch and the capacitors C1 and C2 = 39 Pf.
The oscillator (and the PIC) work fine when I supply the PIC with 5V, but if the voltage goes lower than 4,5V the oscillator stop even if the PIC should work until the supply voltage don't fall below 2V.
Does any one know what's can be the problem?

Thanks to every one!