[GPS_Standard] PIC18F2220 versus PIC18F2221

[robert bownes]

the 2220's are still available from Microchip by the way, I got a batch of
them last week.


On Fri, May 21, 2010 at 2:24 PM, Martein Bakker <martein at xs4all.nl> wrote:

> Hi Bert,
>
> I have looked with a lot of detail at the configuration bits of the 2221
> but
> without results. The bits that could have an impact had the correct values
> already and explicitly specifying them made no difference of course.
>
> I have a 2220 from digikey that works fine, but it remains a question why
> the 2221 does not count. I cannot beleive that I received a bad 2221 chip.
>
> The configuration bits give no solution and the datasheet with respect to
> the counter/timers show no difference at all between 2220 and 2221 like you
> also noticed.
>
> Best regards,
> Martein
> pa3ake
>
> ----- Original Message -----
> From: "Bert, VE2ZAZ" <ve2zaz at sympatico.ca>
> To: <gps_standard at mailman.qth.net>
> Sent: Monday, May 17, 2010 6:13 PM
> Subject: Re: [GPS_Standard] PIC18F2220 versus PIC18F2221
>
>
> >
> > Hi All,
> >
> > I have spent some time this morning trying to see the differences in the
> > timers between the two devices and could not see any. Three of the total
> 4
> > timers can run in 16-bit mode and two of these 4 can run in 8-bit mode.
> > Same features associated to each of them.
> >
> > One difference is the Enhanced USART vs Addessable USART, which brings
> > auto Baudrate detection. But I am pretty sure the must have made the
> > EUSART compatible (by default) withy the AUSART.
> >
> > One area I would spend more time on is the configuration bits. Several
> new
> > bits were added. This is where I suggest working. One bit affects Timer
> 1,
> > which is the one used for the 10MHz frequency capture feature. Also make
> > sure y DO NOT invoke the Extended Instruction set (XINST).
> >
> > Other small differences appear to reside in the Power up reset, the
> > NanoWatt stuff, etc. These should not affect counting operation.
> >
> > I may order one 2221 to try it out, but this is not going to happen in
> the
> > near term. You will probably find the solution before I can try
> > anything...
> >
> > Have fun!
> >
> > Bert, VE2ZAZ
> > http://ve2zaz.net
> >
> > ----------------------------------------
> >> From: martein at xs4all.nl
> >> To: gps_standard at mailman.qth.net
> >> Date: Mon, 17 May 2010 16:45:51 +0200
> >> Subject: Re: [GPS_Standard] GPS_Standard Digest, Vol 34, Issue 1
> >>
> >> 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"
> >> To:
> >> 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"
> >>> Subject: [GPS_Standard] PIC18F2220 versus PIC18F2221
> >>> To:
> >>> 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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