Pls How can I make 16F877A use 15MHz Xtal

[T.Jackson]

T.Jackson,
Yes not to mislead anyone; I typed 15 loosely here. It could have been 8, 16 20 etc; I simply couldnt get any crystal (8, 20, 16 etct) to work. OF course PBP will not compile with DEFINE OSC 15. But it did compile with the listed frequecies 16MHz, 24MHz etc. However at the time I entered this thread I did not know that PBP wil not work with 15
However Thanks to the forum I now know better and I am actually using a 24MHz crystal;-)

I'm unaware of any variant of the 877a that can be clocked as high as 24MHz.