microsoftwarecontrol wrote :

> can't find good price for 4Mhz crystal, but see one sell 
> for 6MHz crystal. 

You must be joking, right ?
You need just one or a realy large batch ?

> I have been test 20Mhz f877a, to 24MHz, without problem.

How do you know it was "without problem" ? It might have
*looked* like that, but you can't be sure.

> any one tried 4MHz pic under 6MHz crystal?

The possibility that a 4 Mhz PIC works with a 6 Mhz
crystal "on the bench" is probably very close to 100%,
but what does that say ?

Get a 4Mhz crystal (or resonator). Or a faster PIC...

B.t.w, the 16(L)C924 is on the "Mature" list, so maybe you
should look for another PIC anyway.

Best Regards,
Jan-Erik.



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