[GPS_Standard] GPS_Standard Digest, Vol 34, Issue 1

[Roberto Barrios]

Hi Martein,

 

One -important- difference between them is that the newer 18f2221 has only 1 8-bit timer, while the older 18f2220 has two. I haven't looked at Bert's source code, but if he uses the second 8-bit timer, the firmware will (if ever possible) require a big design change.

 

If that's the case, probably the price difference is not worth the time it would take to port the code to the newer part.

 

Regards,

Roberto EB4EQA

 
> From: gps_standard-request at mailman.qth.net
> Subject: GPS_Standard Digest, Vol 34, Issue 1
> To: gps_standard at mailman.qth.net
> Date: Sun, 16 May 2010 12:00:04 -0400
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> Today's Topics:
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> 1. PIC18F2220 versus PIC18F2221 (Martein Bakker)
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> 
> ----------------------------------------------------------------------
> 
> 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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