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PICList Thread
'Differences between `55 and `57'
1998\08\19@204447 by Mike Ghormley

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In Lieu of Reading the Manual...

I am about to order a couple of JW parts for development of a project
using the 16C55.  I was thinking (like Clint Eastwood) that for a few
dollars more I could get the 16C57JW instead.  I have used the 12C509JW
to develop 12C508 apps, so why not get the larger capacity chip and then
stay with the memory limits, yes?

It looks like the only difference between them is 24 vs. 72 RAM locations
and 512 vs 2K ROM locations.  Am I right?  Interrupts, I/O, WTD, Timers,
etc is all the same?

I would like to order Thursday so a speedy opinion would be appreciated.

Thanks in advance,

Michael

*************************************************************************When th
e way of the Tao is forgotten, kindness and ethics must be taught.
Men must learn to pretend to be wise and good.  --  Lao Tzu
*************************************************************************

1998\08\19@210339 by Dennis Plunkett

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At 05:39 PM 19/08/98 -0700, you wrote:
>In Lieu of Reading the Manual...
>
>I am about to order a couple of JW parts for development of a project
>using the 16C55.  I was thinking (like Clint Eastwood) that for a few
>dollars more I could get the 16C57JW instead.  I have used the 12C509JW
>to develop 12C508 apps, so why not get the larger capacity chip and then
>stay with the memory limits, yes?
>
>It looks like the only difference between them is 24 vs. 72 RAM locations
>and 512 vs 2K ROM locations.  Am I right?  Interrupts, I/O, WTD, Timers,
>etc is all the same?
>
>I would like to order Thursday so a speedy opinion would be appreciated.
>
>Thanks in advance,
>
>Michael
>
>*************************************************************************Wh
en the way of the Tao is forgotten, kindness and ethics must be taught.
>Men must learn to pretend to be wise and good.  --  Lao Tzu
>*************************************************************************
>
>
Yes Mike,
The 57 has the extra pages of programme code memory and the extra RAM (So
do't go playing with the page bits). Other than that they run the same. I
have done what your doing also.


Dennis

1998\08\19@210546 by Tony Nixon

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Mike Ghormley wrote:
>
> In Lieu of Reading the Manual...

The 57 is much harder to use than the 55 because you need to concern
yourself with the ROM and RAM paging concepts used in the PICs. It's not
so hard to get used to, but it can be a pain.

Excuse this interruption, but there are none in the 55 or 57 chips.

--
Best regards

Tony

Multimedia 16F84 Beginners PIC Tools.
**New PicNPrac**

http://www.picnpoke.com
Email spam_OUTpicnpokeTakeThisOuTspamcdi.com.au

1998\08\19@213711 by Jim Robertson

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At 11:01 20/08/98 +1000, you wrote:
>Mike Ghormley wrote:
>>
>> In Lieu of Reading the Manual...
>
>The 57 is much harder to use than the 55 because you need to concern
>yourself with the ROM and RAM paging concepts used in the PICs. It's not
>so hard to get used to, but it can be a pain.
>
>Excuse this interruption, but there are none in the 55 or 57 chips.
>
>--
>Best regards
>
>Tony

Excuse my interruption, to your  interruption Tony but I think you will
find that there are BOTH RAM and ROM pages in the 16C57 and not so in the
16C55.

Jim

>Multimedia 16F84 Beginners PIC Tools.
>**New PicNPrac**
>
>http://www.picnpoke.com
>Email .....picnpokeKILLspamspam@spam@cdi.com.au
>
--------------------------------------------------------
Jim Robertson
NEWFOUND ELECTRONICS
Email: newfoundspamKILLspampipeline.com.au
http://www.pipeline.com.au/users/newfound
--------------------------------------------------------

1998\08\19@214540 by Calvin

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>>Mike Ghormley wrote:
>>>
>>> In Lieu of Reading the Manual...
>>
>>The 57 is much harder to use than the 55 because you need to concern
>>yourself with the ROM and RAM paging concepts used in the PICs. It's not
>>so hard to get used to, but it can be a pain.
>>
>>Excuse this interruption, but there are none in the 55 or 57 chips.
>>
>>--
>>Best regards
>>
>>Tony
>
>Excuse my interruption, to your  interruption Tony but I think you will


PIC hangs up!!     :)



{Quote hidden}

1998\08\19@214553 by Jim Robertson

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At 17:39 19/08/98 -0700, you wrote:
>In Lieu of Reading the Manual...
>
>I am about to order a couple of JW parts for development of a project
>using the 16C55.  I was thinking (like Clint Eastwood) that for a few
>dollars more I could get the 16C57JW instead.  I have used the 12C509JW
>to develop 12C508 apps, so why not get the larger capacity chip and then
>stay with the memory limits, yes?
>
>It looks like the only difference between them is 24 vs. 72 RAM locations
>and 512 vs 2K ROM locations.  Am I right?  Interrupts, I/O, WTD, Timers,
>etc is all the same?
>
>I would like to order Thursday so a speedy opinion would be appreciated.
>
>Thanks in advance,
>
>Michael

Using 16C57-JW in liu of a 16C55 can be a good idea but remember that there
are some practical considerations. Firstly you will need to modify your
source code as the RESET vector is at different addresses.

You also need to select each device for what it is with your programmer as
you use it. (With the 14-bit core parts  you can get away with programming
a bigger part as a smaller part, not so with the 12-bit core parts because
of the "floating" ID and RESET vector locations. )

If you can cope with the small amount of maintainance involved then what
your propose can be a good idea.

Mind you, for the 14-bit core parts it is MUCH easier.

Jim

>*************************************************************************Wh
en the way of the Tao is forgotten, kindness and ethics must be taught.
>Men must learn to pretend to be wise and good.  --  Lao Tzu
>*************************************************************************
>
--------------------------------------------------------
Jim Robertson
NEWFOUND ELECTRONICS
Email: newfoundspamspam_OUTpipeline.com.au
http://www.pipeline.com.au/users/newfound
--------------------------------------------------------

1998\08\19@215821 by Tony Nixon

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Jim Robertson wrote:

> Excuse my interruption, to your  interruption Tony but I think you will
> find that there are BOTH RAM and ROM pages in the 16C57 and not so in the
> 16C55.

Interruptions, Interruptions....

>The 57 is much harder to use than the 55 because you need to concern
>yourself with the ROM and RAM paging concepts used in the PICs.

Isn't that what I said :-))

--
Best regards

Tony

Multimedia 16F84 Beginners PIC Tools.
**New PicNPrac**

http://www.picnpoke.com
Email @spam@picnpokeKILLspamspamcdi.com.au

1998\08\19@220414 by Andrew Warren

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Mike Ghormley <KILLspamPICLISTKILLspamspamMITVMA.MIT.EDU> wrote:

> It looks like the only difference between [16C55 and the 16C57] is
> 24 vs. 72 RAM locations and 512 vs 2K ROM locations.  Am I right?

Mike:

Yeah, you're right, but those differences have implications
that might not be immediately obvious.  The two most important
things to remember are:

   1.  The 16C57's reset vector is at 0x7FF; the 16C55's is
       at 0x1FF.

   2.  A 16C55 "Clear RAM" routine (as usually written, with
       an "INCFSZ FSR" at the end of the loop) won't work on
       the 16C57.

       It'll fail to clear the RAM in the 16C57's upper 3 banks --
       you'd expect that -- but it'll ALSO fail to terminate the
       "Clear RAM" loop at all... The PIC will stay in that loop
       forever (or until the Watchdog Timer resets it).

-Andy


=== Andrew Warren - RemoveMEfastfwdTakeThisOuTspamix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499

1998\08\19@221452 by Jim Robertson

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At 11:55 20/08/98 +1000, you wrote:
>Jim Robertson wrote:
>
>> Excuse my interruption, to your  interruption Tony but I think you will
>> find that there are BOTH RAM and ROM pages in the 16C57 and not so in the
>> 16C55.
>
>Interruptions, Interruptions....
>
>>The 57 is much harder to use than the 55 because you need to concern
>>yourself with the ROM and RAM paging concepts used in the PICs.
>
>Isn't that what I said :-))


Given your reputation for well considered  anwsers I'll more than take your
work for it. This is the bit I was refering too:

"Excuse this interruption, but there are none in the 55 or 57 chips."

Who said?  There were no ">" or similar charaters to delineate. I'm
confused, time for a coffee I reckon.


Best regards

Jim



>Multimedia 16F84 Beginners PIC Tools.
>**New PicNPrac**
>
>http://www.picnpoke.com
>Email spamBeGonepicnpokespamBeGonespamcdi.com.au
>
--------------------------------------------------------
Jim Robertson
NEWFOUND ELECTRONICS
Email: TakeThisOuTnewfoundEraseMEspamspam_OUTpipeline.com.au
http://www.pipeline.com.au/users/newfound
--------------------------------------------------------

1998\08\20@035855 by Mike Ghormley

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Thanks to all.  I will remember your caveats and go with the `57JW tomorrow.

I appreciate the speedy replies!

Michael

*************************************************************************
When the way of the Tao is forgotten, kindness and ethics must be taught.
Men must learn to pretend to be wise and good.  --  Lao Tzu
*************************************************************************

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