So it did for me. Fortunately I have CCS' MachX programmer 
and it automatically recalculates the osccal value.

PerL


----- Original Message ----- 
From: "WH Tan" <whsiung.my@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Tuesday, September 19, 2006 11:57 PM
Subject: Re: [PIC] Problem with PIC12F675 A/D conversion


>> calibration data.  During the days I worked with those headers, I
> found that the calibration data will be lost for some unknown reason.
> I would highly recommend you to record down the calibration data
> before you start doing anything with it.


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