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PICList Thread
'Over-clocking'
1999\05\06@025644 by netquake

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Hello everybody!

I would like to know what would be the expected
behaviour of an over-clocked PIC. In my case I want to
use a PIC16F84-04 at frecuencies above the 4Mhz. I've
seen projects using 10Mhz xtal and even 12Mhz xtal (pong)
with this particular chip. What's the highest frecuency
this micro can tolerate?
Also, given the fact Microchip produces PIC16F84s for
10Mhz xtals. Is it possible to overclock this ones even
higher?
I'm asking this because a faster chip would make my
project coding easier and the PCB is designed for a
16F84.

I'm sure more than a couple of you have this issue
xtal clear! (-;

Thanks!

------------------------------------
netQ <spam_OUTnetquakeTakeThisOuTspaminnocent.com>
http://virtuaweb.com/picprog
"Home of amateur PIC programmers..."

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1999\05\06@031842 by Don McKenzie

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netQ wrote:
>
> Hello everybody!
>
> I would like to know what would be the expected
> behaviour of an over-clocked PIC. In my case I want to
> use a PIC16F84-04 at frecuencies above the 4Mhz. I've
> seen projects using 10Mhz xtal and even 12Mhz xtal (pong)
> with this particular chip. What's the highest frecuency
> this micro can tolerate?
>  Also, given the fact Microchip produces PIC16F84s for
> 10Mhz xtals. Is it possible to overclock this ones even
> higher?
>  I'm asking this because a faster chip would make my
> project coding easier and the PCB is designed for a
> 16F84.

Most 84s can be speed up to 8Mhz, but note that this doesn't comply with
manufacturers specs. Tin canned, 4 legged TTL Oscillators may speed it
along at 12Mhz too, but watch out for internal EEPROM read/write
cycles! Gary Barnes of Western Australia put me onto the 12Mhz
Oscillator trick.

Other users have told me that you can get some 4Mhz PICs running at 16
and 20Mhz by just putting a 10Meg resistor across the faster crystal.

Don McKenzie  .....donKILLspamspam@spam@dontronics.com http://www.dontronics.com

Don's Download Dungeon:   http://www.dontronics.com/download.html
Australian Electronics Ring http://www.dontronics.com/aering.html
Win $500USD Cash. Micro design contest:  http://www.simmstick.com

1999\05\06@115546 by Dave VanHorn

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> I would like to know what would be the expected
> behaviour of an over-clocked PIC. In my case I want to
> use a PIC16F84-04 at frecuencies above the 4Mhz. I've
> seen projects using 10Mhz xtal and even 12Mhz xtal (pong)
> with this particular chip. What's the highest frecuency
> this micro can tolerate?


If you're making a hobby project for yourself, go ahead. It either works, or
it dosen't.
If you're thinking about making more than one, then 4.000 is as fast as I'd
go.

1999\05\06@125509 by engelec

picon face
Over clocking  doesn't mean it is not going to work
it simply means there is no guaranty will work on

1. high or low temperature
2. noise
3. vibration
4. pressure
5. VDD min and max

if you do not care about all that then go ahead.


Andre Abelian

1999\05\06@133633 by Dave VanHorn
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> Over clocking  doesn't mean it is not going to work
> it simply means there is no guaranty will work on
>
> 1. high or low temperature
> 2. noise
> 3. vibration
> 4. pressure
> 5. VDD min and max

6. the next chip out of the tube.
7. all instructions

It's just not a good idea.

1999\05\06@142217 by ryan pogge

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yea well they say overclocking your computer isnt good
either but Ive had a PII 266 running at 412mhz
and a PII 333 running at 464 for about a year now....
=]

{Quote hidden}

1999\05\06@143252 by Andres Tarzia

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Here in Argentina, our one and only local Microchip provider does not import
10Mhz 16F84 parts, they just sell 4Mhz ones. The say that all 4Mhz parts
works perfectly at 10Mhz, so there is no need for them to import the fast
parts...

{Quote hidden}

1999\05\07@002708 by Ravi Pailoor

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part 0 478 bytes content-type:text/x-vcard; charset=us-ascii; name="vcard.vcf" (decoded 7bit)

Pailoor

Andres Tarzia wrote:

>  The say that all 4Mhz parts works perfectly at 10Mhz, so there is no need for
> them to import the fast
> parts...
>

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Attachment converted: wonderland:vcard.vcf (TEXT/CSOm) (0002F4D2)

1999\05\07@050313 by Benjamin Petersen

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> Here in Argentina, our one and only local Microchip provider
> does not import
> 10Mhz 16F84 parts, they just sell 4Mhz ones. The say that all
> 4Mhz parts
> works perfectly at 10Mhz, so there is no need for them to
> import the fast
> parts...

I do think that 04 parts have failed the 10 test

Regards
Benjamin Petersen

1999\05\07@124046 by Andres Tarzia

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>
>> Here in Argentina, our one and only local Microchip provider
>> does not import
>> 10Mhz 16F84 parts, they just sell 4Mhz ones. The say that all
>> 4Mhz parts
>> works perfectly at 10Mhz, so there is no need for them to
>> import the fast
>> parts...
>
>I do think that 04 parts have failed the 10 test
>
>Regards
>Benjamin Petersen

I didn't test them at 10Mhz

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