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'12C508 cal value on window version'
1998\03\02@201511 by David Sprenkle

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Anyone out there have a 12c508 window.  What is the preset internal osc
value.  I know that it is dependent on processing factors I just wanted
a starting point.

--
David Sprenkle

1998\03\02@203618 by Mauro, Chuck

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I have several.  The 4 bit OSCCAL field is nominally set at 8.  A value
of 8 is the center point for the oscillator, so it might not be uncommon
to see a 7 or 9.  My values from the windowed parts were 9 for the two
parts I looked at several months ago.

Chuck Mauro


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1998\03\03@152306 by wwl

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On Mon, 2 Mar 1998 19:08:47 -0800, you wrote:

>Anyone out there have a 12c508 window.  What is the preset internal osc
>value.  I know that it is dependent on processing factors I just wanted
>a starting point.
AFAIK. It is set by the factory the same as for OTP's, so you should
read out the value from a new chip and write it on the chip for when
you erase it.
I have 2 early ones which need OSCCALS of 4 and 5 (determined by
testing - I forgot to read them!)
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1998\03\03@160519 by ken

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In article <.....34FB743E.C4F76A7BKILLspamspam.....busprod.com>, David Sprenkle
<EraseMEsprenklespam_OUTspamTakeThisOuTBUSPROD.COM> writes
>Anyone out there have a 12c508 window.  What is the preset internal osc
>value.  I know that it is dependent on processing factors I just wanted
>a starting point.
>

I purchased a couple of JW parts a few weeks ago and I decided to make a
note of the osc cal value before I used them, but when I read them in my
PICSTART plus the location read 00. Anyone any ideas why, if I look at
the OTP parts they read the same.

Ken.

+-----------------------------+--------------------------------------------+
|      Ken Hewitt  G8PWC      |        Email kenspamspam_OUTwelwyn.demon.co.uk        |
|      /\/\/\/\/\/\/\/\/      |  Homepage   http://www.welwyn.demon.co.uk  |
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1998\03\03@192052 by Mike Keitz

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On Tue, 3 Mar 1998 18:52:35 +0000 ken <@spam@kenKILLspamspamWELWYN.DEMON.CO.UK> writes:
>I purchased a couple of JW parts a few weeks ago and I decided to make
>a
>note of the osc cal value before I used them, but when I read them in
>my
>PICSTART plus the location read 00. Anyone any ideas why, if I look at
>the OTP parts they read the same.

You may need to open the "Calibration Data" window to see the value.  In
the program memory window, the last location which holds the movlw with
the calibration value is (incorrectly) shown as 000.  Later versions of
MPLAB (3.3 or so) do show it correctly in the program memory window as
well.

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1998\03\03@202637 by J Nagy

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       I have two 508JWs - one has an osccal value of 5, the other is 10
(decimal). I believe the power-on reset value is 7, not 8.
       If you need a starting point to determine what osccal should be,
you might consider a simple loop that continually toggles an output bit,
and varies osccal on the fly every time an input pin is (manually) pulsed.
By measuring the frequency at this output pin, you can tell what the
internal oscillator is really running at. The remaining four unused pins
would be available for outputting the value of osccal for you to read (only
the upper nibble is used by osccal so 4 bits are fine). I think there was
some talk on this topic posted a while ago - you may want to check the
archives for more info.

       Jim

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