[GPS_Standard] GPS_Standard Digest, Vol 34, Issue 1

[Zack Widup]

 Hi Martein,

Can you get some 18F2220's? I think they still are available. At least
Digi-Key in the USA still sells them.

73, Zack W9SZ

  On Mon, May 17, 2010 at 9:45 AM, Martein Bakker <martein at xs4all.nl> wrote:

> Hi Roberto,
>
> I think that is an error in the datasheet overview of the 2221. I have
> recompiled the firmware with the 18F2221 include file and I had to fix 3
> errors having to do with different names of the configuration bits.
>
> Now when I use this new firmware compiled for 2221, I have exactly the same
> result. It does not count properly. The hexfiles only differ for the bits
> that describe the configuration bits. And that is correct that is also a
> visible difference the datasheet.
>
> If you go through the datasheets of the 2220 and 2221 side by side on the
> pages that describe the timer counter hardare, there is no difference to be
> found.
>
> I am going to leave it now. I am not a PIC expert and don't want to become
> one Hi!
>
> Best 73's,
> Martein
> pa3ake
>
> ----- Original Message -----
> From: "Roberto Barrios" <rbarrioss at msn.com>
> To: <gps_standard at mailman.qth.net>
>  Sent: Monday, May 17, 2010 4:20 PM
> Subject: Re: [GPS_Standard] GPS_Standard Digest, Vol 34, Issue 1
>
>
> > Hi Martein,
> >
> > Now I'm not so sure... Looking at page 3 (as per AdobeReader) of the
> > 18F2220
> > datasheet, lower right corner, you can read "timers 8/16bit: 2/3", but
> > there
> > is no more info on the fifth counter, in page 10 it says this part has 4
> > timers. Now I am not sure where the issue is.
> >
> > Regards,
> > Roberto EB4EQA
> >
> > -----Original Message-----
> > From: gps_standard-bounces at mailman.qth.net
> > [mailto:gps_standard-bounces at mailman.qth.net] On Behalf Of
> > gps_standard-request at mailman.qth.net
> > Sent: domingo, 16 de mayo de 2010 18:00
> > To: gps_standard at mailman.qth.net
> > Subject: GPS_Standard Digest, Vol 34, Issue 1
> >
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> > Today's Topics:
> >
> >   1. PIC18F2220 versus PIC18F2221 (Martein Bakker)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Sat, 15 May 2010 21:47:28 +0200
> > From: "Martein Bakker" <martein at xs4all.nl>
> > Subject: [GPS_Standard] PIC18F2220 versus PIC18F2221
> > To: <gps_standard at mailman.qth.net>
> > Message-ID: <574096AB150146CFBD63DFAE3EFE9A85 at mhbp5q>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Hi list!
> >
> > I have succesfully built the VE2ZAZ GPS standard.
> >
> > Initially I used PIC18F2221 as I could not get PIC18F2220. The 18F2221 is
> > supposed to be the newer and better part and successor of 18F2220. I went
> > through the datasheets and could not see any difference that would
> prevent
> > the 18F2221 to work in this application. However it failed to work
> > partially
> > in practice. Montrol software could talk with it, but the measured
> > frequency
> > was always 0 and strange enough the frequency difference was not 0, but
> > the
> > MSB byte was always 0! Obviously it did not lock.
> >
> > Does anyone know why the 18F2221 does not work with this application? It
> > would be great if the firmware is compatible with this device as it is
> > much
> > cheaper.
> >
> > Best regards
> > Martein
> > pa3ake
> >
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> > End of GPS_Standard Digest, Vol 34, Issue 1
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