Hello Charudatt,

C>>I am still confused to the fact that a PIC can be Overclocked without any problem.

I mean to say run it at 20Mhz with a 4 Mhz PIC.

Is that true?<<

I device (a PIC chip in this case) is guaranteed by the manufacture to run up to a certain point. You can push (overclock) these chips to some degree, but there is no guarantee they will preform above the manufacturers specifications. Most will preform above the manufactures specifications...but the faster you go, the more heat you generate, and the closer you come to exceeding the chips limits... thus reliability problems will start to crop up.

Dwayne