Pls How can I make 16F877A use 15MHz Xtal

[skimask]

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

Maybe I'll send you my special one that was clocked at 32Mhz for awhile.
I don't know why it worked, but it did. Would it work under all conditions, using all modules, under all combinations of code? Probably not, but it worked for me.
(Yes, I know it's a one-off situation and they're only rated for 20Mhz)

[Acetronics2]

Hi, Skimask

ALL the pics I use are "overclocked" to their max. "µChip" freq. ... my old 16F84-04, 16F628-04, 16F876-04, 16F877-04 and else happily run @ 20 mhz.
32 Mhz is not really surprising nor, I often read about !!!

this fact is well known, also well known those chips have not being TESTED over the whole voltage, temp. and freq. range !!!

Just keep in mind those overclocked chips are not guaranteed by µChip ... that's the only point to care with when professionnal use !!!

May be we also might point out that , these days, "Non Rohs" devices are sold at a really fair price ...

Alain

[T.Jackson]

Maybe I'll send you my special one that was clocked at 32Mhz for awhile.
I don't know why it worked, but it did. Would it work under all conditions, using all modules, under all combinations of code? Probably not, but it worked for me.
(Yes, I know it's a one-off situation and they're only rated for 20Mhz)

Nah I'll be right. Not in the habit of challenging large teams of professional engineers. The data sheet says 20 - that's as far as I go.