[GPS_Standard] GPS_Standard Digest, Vol 34, Issue 1

[Roberto Barrios]

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

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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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