16F877 Wackiness

[financecatalyst]

Hi
I have jumped on to use a 16F877A, Its the first time I am trying to use an external oscillator : Can you please give me the values you have used for the capacitors which are Grounding the Osc1 & Osc2. I have an 2 Pin ceramic 4MHz Oscillator connect between Osc1 & Osc 2
Thanks

[Dino308gt4]

Hi
I have jumped on to use a 16F877A, Its the first time I am trying to use an external oscillator : Can you please give me the values you have used for the capacitors which are Grounding the Osc1 & Osc2. I have an 2 Pin ceramic 4MHz Oscillator connect between Osc1 & Osc 2
Thanks

I use a pair of 22pf caps.

[financecatalyst]

Thanks for the input. I have followed and something very strange is happening :

I am using an external oscillator 4MHz. My program simply toggles one pin every 30ms.
Problem is that I see sometimes the toggling if I touch the PIC,leg of the capacitor (earth) or touch the bench the circuit is left on and sometimes it works fine and sometimes the led is just on constantly.

I have never ever seen this happening with any PIC I have used till now. What could be the reason for this??? Any advise ????