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'[PIC]: overclocking PIC18Fxx2'
2002\07\10@062333 by Vasile Surducan

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Hi piclisters,

Please don't start the answer to my question with remarks like:
"read the datasheet" or "overclocking is not allowed" ;)

I just want to now if someone has tried to overclock a little the
18F in HS/PLL mode, and which was the shortest clock instruction cycle
achieved.

thx,
Vasile
http://www.geocities.com/vsurducan

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2002\07\10@083216 by Bob Ammerman

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I accidently overclocked an 18C at 11.052 MHz * 4 (via PLL). Digikey sent me
the wrong crystal when I ordered 10Mhz units.

It seemed to work fine at normal room temp and Vdd = 5V. Except for the fact
that all my extremely critical timing was off by 10+% and it took me way to
long to figure out why.

Of course, I do have to say "overclocking is not allowed" ;)

Bob Ammerman
RAm Systems


{Original Message removed}

2002\07\11@031905 by Vasile Surducan

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So, it worked, even it wasn't allowed, right ? :-))
Thx,
Vasile

pic/jal newface design contest at:

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



On Wed, 10 Jul 2002, Bob Ammerman wrote:

{Quote hidden}

> {Original Message removed}

2002\07\11@102251 by Bob Ammerman

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At the then-current ambient temp, power supply voltage and phase of the
moon, and on that one chip: yes.

Bob Ammerman
RAm Systems

{Original Message removed}


'[PIC]: overclocking PIC18Fxx2'
2002\10\26@225952 by Stefano
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I was able to select some 18F252s running at 48MHz.
The 18FXX20 have BIG problems above 32MHz.

SC


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2002\10\26@231407 by Jim

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All instructions tested in all addressing modes
and over a small range of Vcc values as well as
at low, mid and high ambient temperatures?

Just HAD to ask!

RF Jim (no stranger to testing equipment/parts over
       the mil temp range in a former life.)

----- Original Message -----
From: "Stefano" <mlcoll2spamKILLspamNIETZSCHE.MIT.EDU>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Saturday, October 26, 2002 9:27 PM
Subject: Re: [PIC]: overclocking PIC18Fxx2


> I was able to select some 18F252s running at 48MHz.
> The 18FXX20 have BIG problems above 32MHz.
>
> SC
>
>

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2002\10\29@004237 by Michael Simpson

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I have had 18F252 and 18F452 running at about 58Mhz internaly and had no
problem at all with them.   You have to adjust timing and set registers a
bit different but I found no reliability problems with short term use.  Not
done any long term use though.

{Original Message removed}

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