How to efficiently overclock PIC18Fxx2 and SX28 micros?!

[Sobakava]

I tried to run some of them with 12MHz and 13 MHz crystal with x4
PLL. It worked at 12x4:48Mhz fine but at 13x4:52MHz didn't worked
for all of chips.

I got better results with oscillators (50MHz) instead of crystals.

I heard SXs can be overclocked much more efficiently. ??

Did you ever tried to overclock PIC18F and SX28 micros?

Opinions?

 

[newmania]

pic 18f overclocking

I know pic16f84-10p works at 12 mhz but i never heard for pic18f micros. I think it's possible to overclock but hard to find 43-44mhz crystal.

 

[sick_man]

can you over clock pic16f84a-04

i tied a few things with picc84 some years ago

a 4 mhz one could be run {although it did hang every so often}
at 20 mhz using a xtal and a 7404 as its driver
then just using one pin on the pic set too hs mode and told to compile for 20 mhz

it ran ok so i guess it is like potatoes you buy....

 

[beuch]

pic18f4520 overclock

Hi Sobakava,

I am interested in overclocking 18fxx2, let me know if you got information to do so.

beuch

 

[Sobakava]

overclock a pic16f877 to 24mhz

Hi beuch,

Test setup is installed on my desk. I'm trying different osillators and
better :bench type function generator.

What do you want to know about results?

 

[beuch]

pic overclocking

Hi,

I use a 16MHz quartz on my 18f252.

But for futur use I could be interested in speed internal treatments and I would know if I can go over the 40MHz specified by microchip.

thank you.

beuch.

 

[Nick C.]

pic18 how to overclock

You might get away with overclocking, but then again
you might not. Think of it this way - if the part was
stable at a higher frequency than specified, you can be
sure that the manufacturer is going to sell it as spec'd
for that higher frequency.

Nick C.

 

[servopump]

pic18f overclocking

I was only able to go to 24MHz on a 20MHZ PIC16F877

 

[Nick C.]

running pic16f84 at 12mhz

Here is a link with a little bit more information
about overclocking PICs.

http://www.piclist.com/techref/overclock.htm

Nick C.