gnupic: Re: [gnupic] pic18f24j10
Subject:
Re: [gnupic] pic18f24j10
From:
Rob Hamerling ####@####.####
Date:
2 Jul 2007 18:39:49 +0100
Message-Id: <46893866.6000501@gmail.com>
Hallo Michael,
Michael Ballbach wrote:
> On Mon, Jul 02, 2007 at 09:08:45AM +0200, Rob Hamerling wrote:
>> And this is not even the complete list! I scanned the device (.dev)
>> files of MPLAB 7.61 and found the following list of 18FxxJxx PICS with
>> 'non-expected' config address values.
>
> Interesting! Our configuration table was extracted from an older version
> of MPASM. I have extracted data from this 7.61, but some of the address
> fields ended up empty from the script that extracts the data from the
> executable, which led me to believe that some format might have changed
> and the data was invalid. I still haven't verified it. Hopefully I can
> do so soon and we will have an updated database.
I have of a script (in Rexx language) to check the configuration files
of my Wisp628 support program Xwisp2. And I use some variants of this
script for different purposes for example to build lists of specific
(sub)families. I have to update my scripts from time to time because of
changes (and errors) in the MPLAB files. So your experience doesn't
really surprise me. ;-)
I just started to read about this 18FxxJxx chips and I found an
interesting paragraph in datasheet DS39682C:
Unlike most PIC18 microcontrollers, devices of the
PIC18F45J10 family do not use persistent memory
registers to store configuration information. The config-
uration bytes are implemented as volatile memory
which means that configuration data must be
programmed each time the device is powered up.
I suppose the meaning of 'configuration bits' has changed a little....
Regards, Rob
--
Rob Hamerling, Vianen, NL (http://www.robh.nl/)
