On Wed, Jan 08, 2014 at 07:40:20PM +0000, David C Brown wrote:
> Thanks for that.  I shall study the '1938.  I hav to admit that I find it
> very difficult to select microchip products.  It would be really usefull =
to
> have a chart showing the evolutionary path of the various chips.

It's definitely a problem. Personally I switched wholesale to the enhanced
16F line about 3 years ago. A ton more features with a price point that is
close to identical to the base midrange counterparts.

Based on a suggestion from the list I've started experimenting with the
PIC24FV line of chips. 5V tolerent I/O. Runs up to 40 MIPS on an internal
osciallator. Acres of memory. And the piece de resistance is the 16 working
registers which are each 16 bit and each an be used for operations and
addressing. A truly beautiful architecture.

BAJ

>=20
>=20
> On 8 January 2014 18:13, Byron Jeff <byronjeff@mail.clayton.edu> wrote:
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> > On Wed, Jan 08, 2014 at 03:54:18PM +0100, Jan-Erik Soderholm wrote:
> > > Hi.
> > >
> > > There are no 1-to-1 match between them, but the 16F882 seems
> > > to be a normal 28-pin device. There are *a lot* of enhanced
> > > 28-pin versions and only you can say which one of them
> > > matches your needs best.
> >
> > I agree.  From a real quick comparison of the 16F882 and the 16F1938.
> >
> > http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=3Den530146
> > http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=3Den538157
> >
> > it looks like except for the number of Cap Touch Channels (11 for 882, =
8
> > for the 1938), that each and every component of the 882 has a matching =
or
> > enhanced counterpart in the 1938.
> >
> > >
> > > On the other hand, maybe you should not change device if
> > > you do not actualy has a problem with the stack depth.
> > >
> > > On yet another hand, there are a lot of *other* nice
> > > "enhancements" in the enhanced midrange range... :-)
> >
> > Agreed here too. The accessible stack, linear memory, double the number=
 of
> > FSR/INDF register sets, and the 14 additional enhanced instructions are
> > just the tip of the iceberg in terms of improvements.
> >
> > BAJ
> >
> > >
> > > Jan-Erik.
> > >
> > >
> > >
> > >
> > >
> > > David C Brown wrote 2014-01-08 15:32:
> > > > I am designing around the 16F882.  Is there an enhanced version of
> > that?
> > > >
> > > >
> > > > On 8 January 2014 14:05, Jan-Erik Soderholm <
> > jan-erik.soderholm@telia.com>wrote:
> > > >
> > > >> Hi.
> > > >>
> > > >> All "enhanced mid-range" has 16 levels.
> > > >> And you want probably these in any new design anyway.
> > > >> Doesn't help keeping track, but give more headroom... :-)
> > > >>
> > > >> Jan-Erik.
> > > >>
> > > >>
> > > >> David C Brown wrote 2014-01-08 14:48:
> > > >>> The return stack on the mid range PICs is limited to 8 levels.
> >  Whilst
> > > >> this
> > > >>> is generally  adequate it is difficult to keep track of the call
> > depth.
> > > >>   Is
> > > >>> there any tool for examining a program for maximum call depth?
> > > >>>
> > > >> --
> > > >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > > >> View/change your membership options at
> > > >> http://mailman.mit.edu/mailman/listinfo/piclist
> > > >>
> > > >
> > > >
> > > >
> > > --
> > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > > View/change your membership options at
> > > http://mailman.mit.edu/mailman/listinfo/piclist
> >
> > --
> > Byron A. Jeff
> > Chair: Department of Computer Science and Information Technology
> > College of Information and Mathematical Sciences
> > Clayton State University
> > http://faculty.clayton.edu/bjeff
> > --
> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
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> __________________________________________
> David C Brown
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> View/change your membership options at
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Byron A. Jeff
Chair: Department of Computer Science and Information Technology
College of Information and Mathematical Sciences
Clayton State University
http://faculty.clayton.edu/bjeff
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