> I am facing problem of program execution, I think the problem is
oscillator
> because I tried 4Mhz xtal with 33 pf cap it work fine, but with 20 Mhz
xtal it
> works but randomly.

At 20 MHz make sure you are using HS oscillator mode, not XT.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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