[GPS_Standard] GPS_Standard Digest, Vol 34, Issue 1

[Bert, VE2ZAZ]

The '2220 is still the one I distribute. I get them from Digikey.

One interesting thing is that Digikey flag the '2221 as a possible 
substitute...

Cheers,

Bert, VE2ZAZ

----------------------------------------
>> Date: Mon, 17 May 2010 11:01:37 -0500
>> From: w9sz.zack at gmail.com
>> To: gps_standard at mailman.qth.net
>> Subject: [GPS_Standard] GPS_Standard Digest, Vol 34, Issue 1
>>
>> 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  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" 
>>> 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
>>>>
>>>> Send GPS_Standard mailing list submissions to
>>>> gps_standard at mailman.qth.net
>>>>
>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>> http://mailman.qth.net/mailman/listinfo/gps_standard
>>>> or, via email, send a message with subject or body 'help' to
>>>> gps_standard-request at mailman.qth.net
>>>>
>>>> You can reach the person managing the list at
>>>> gps_standard-owner at mailman.qth.net
>>>>
>>>> When replying, please edit your Subject line so it is more specific than
>>>> "Re: Contents of GPS_Standard digest..."
>>>>
>>>>
>>>> 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=so-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
>>>>
>>>> ------------------------------
>>>>
>>>> _______________________________________________
>>>> GPS_Standard mailing list
>>>> GPS_Standard at mailman.qth.net
>>>> http://mailman.qth.net/mailman/listinfo/gps_standard
>>>>
>>>>
>>>> End of GPS_Standard Digest, Vol 34, Issue 1
>>>> *******************************************
>>>>
>>>> ______________________________________________________________
>>>> GPS_Standard mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/gps_standard
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:GPS_Standard at mailman.qth.net
>>>>
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>
>>> ______________________________________________________________
>>> GPS_Standard mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/gps_standard
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:GPS_Standard at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>>
>> ______________________________________________________________
>> GPS_Standard mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/gps_standard
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:GPS_Standard at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>