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'[PIC]: Problems with A version of 16F877'
2003\03\01@215920 by David Dunn

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I've switched to the 16F877A from a 16F877 and having a problem with my code.  Before I get into a long drawn-out
discussion of the exact problem .. are there some standard things I should to to make the "a" version act like the
original (non-a) ?


Thanks,


DLD

David Dunn
Digital Racing Products

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2003\03\01@223112 by Dwayne Reid

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At 08:58 PM 3/1/03 -0600, David Dunn wrote:
>I've switched to the 16F877A from a 16F877 and having a problem with my
>code.  Before I get into a long drawn-out discussion of the exact problem
>.. are there some standard things I should to to make the "a" version act
>like the original (non-a) ?

<http://www.microchip.com/download/lit/migrat/39591a.pdf> is the migration
document that covers the issues when migrating from the '877 to '877A

No more than 30 seconds to find this on Microchip's site.

dwayne

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2003\03\01@224509 by David Dunn

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it only took you 30 seconds to find this because you knew it existed


dld

On Sat, 1 Mar 2003 20:29:16 -0700, Dwayne Reid wrote:

{Quote hidden}

David Dunn
Digital Racing Products

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2003\03\02@105632 by Olin Lathrop

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> I've switched to the 16F877A from a 16F877 and having a problem with my
> code.  Before I get into a long drawn-out discussion of the exact
> problem .. are there some standard things I should to to make the "a"
> version act like the original (non-a) ?

I haven't used the 16F87xA yet, but I did notice the other day that these
have a comparator added.  The comparator pins probably wake up as analog
inputs, which might mess up your existing code.


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(978) 742-9014, http://www.embedinc.com

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2003\03\02@141754 by Dwayne Reid

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At 09:43 PM 3/1/03 -0600, David Dunn wrote:

>it only took you 30 seconds to find this because you knew it existed

Sorry - didn't mean to come off sounding flippant.  But it might be worth a
few minutes for you to peruse Microchip's website - look under the heading
"Engineer's Toolbox" (2nd heading at the top).  There are many goodies on
that website - not all are easy to find but the stuff in that section will
save you time.

In this case, I thought that I remembered something from a previous
visit.  Note: didn't know for sure and didn't know where it was.  Went to
the website, clicked on that heading (Engineer's Toolbox) and there it was
- right near the bottom of the list.

dwayne

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2003\03\02@151228 by Al Williams

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One thing that is not in that document (and I've complained to
Microchip):

The code protection options are different. If you used to code protect
the top 1/4, for example, that option is no longer available. Well, at
least on the 873 -- I'm assuming the 877 is the same.

Al Williams
AWC
* New PIC Prototype PCB and kits: http://www.al-williams.com/gpmpu28.htm




> <http://www.microchip.com/download/lit/migrat/39591a.pdf> is
> the migration document that covers the issues when migrating
> from the '877 to '877A
>

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2003\03\02@190521 by Herbert Graf

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> At 08:58 PM 3/1/03 -0600, David Dunn wrote:
> >I've switched to the 16F877A from a 16F877 and having a problem with my
> >code.  Before I get into a long drawn-out discussion of the exact problem
> >.. are there some standard things I should to to make the "a" version act
> >like the original (non-a) ?
>
> <http://www.microchip.com/download/lit/migrat/39591a.pdf> is the migration
> document that covers the issues when migrating from the '877 to '877A
>
> No more than 30 seconds to find this on Microchip's site.

       A quick read: it looks like there are no code changes necessary for the new
part (except for programming). TTYL

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2003\03\02@190727 by Herbert Graf

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> it only took you 30 seconds to find this because you knew it existed

       I didn't know it existed either, yet if you go to the 16F877A part of the
microchip site it's listed right there, pretty easy to find if you ask me.
TTYL

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2003\03\05@111406 by David Dunn

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great tip .. i'll do that.

thanks a bunch dwayne !



dld

On Sun, 2 Mar 2003 12:16:08 -0700, Dwayne Reid wrote:

{Quote hidden}

David Dunn
Digital Racing Products

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