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'Requirments for 16F84 programmers'
1998\09\16@145644 by Cranston Grey

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I recently ordered a couple of 16F84 to attempt my first PIC project.
JDR sent me 10mhz version instead of 4. I plan to breadboard then build
a simple programmer.

My question is: will simple programmers like david Tait's work with the
10mhz clock speed. I have spent some time on the web looking for an
anwser, but it's not spelled out anywhere.

Thanks.

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1998\09\16@161523 by Don McKenzie

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Cranston Grey wrote:
>
> I recently ordered a couple of 16F84 to attempt my first PIC project.
> JDR sent me 10mhz version instead of 4. I plan to breadboard then build
> a simple programmer.
>
> My question is: will simple programmers like david Tait's work with the
> 10mhz clock speed. I have spent some time on the web looking for an
> anwser, but it's not spelled out anywhere.

Yes they will program ok.

Don McKenzie  spam_OUTdonTakeThisOuTspamdontronics.com   http://www.dontronics.com

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For more details, send a blank message to .....infoKILLspamspam@spam@dontronics.com
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1998\09\16@171144 by ronruss

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Yes it will program it. The 10 mhz is the max freq the part is
quaranteed to work at.

Cranston Grey wrote:

{Quote hidden}

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From: Ron Russ
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1998\09\17@061028 by paulb

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And yet another answer!

 All parts from production are potential 10MHz parts (as far as we can
gather, and I've heard no-one from *any* company seriously refute this
principle).  They are tested, possibly individually but more likely by
batch sampling, for performance and stamped accordingly as "4MHz",
"10MHz" or whatever.  It is *possible* that once enough "premium"
devices have been allocated to market requirements, other components of
equal performance are sold at a lesser specification.

 What this means is that there isn't *necessarily* any difference
between a "4MHz" and a "10MHz" one.  Some people test them at higher
clock speeds again and if they feel their testing is adequate to cover
the likely conditions, proceed to use them at the higher speed.

 It is axiomatic that a device which will work at a particular clock
rate will work at *any* slower speed and you will note the PIC is
characterised to DC clocking.  This applies equally to programming.

Cranston Grey wrote:

> JDR sent me 10mhz version instead of 4.

 Which did they charge you for?  You may be lucky!

> My question is: will simple programmers like david Tait's work with
> the 10mhz clock speed.

 The programmer doesn't use the clock; it provides its own.  In fact,
it works better *without* the clock (crystal) connected.

> I have spent some time on the web looking for an anwser, but it's not
> spelled out anywhere.

 It often happens.
--
 Cheers,
       Paul B.

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