Most of these chips actually reset to the highest ROM location, execute the
movlw xx command found there and when the pcl rolls over to 0 you find that
"automatically loading W after reset" has happened.  You then choose to use
or ignore the value with your first program instruction.

If you have a blank 12C67x why don't you just read it to see if it has a
(factory installed!) movlw xx at the highest location?

Bye.

-----Original Message-----
From: Drew Vassallo [mailto:snurple@HOTMAIL.COM]
Sent: Thursday, 29 November 2001 6:52
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: Oscillator calibration for PIC12ce519


>Making use of the calibration constant in your program is dead easy.  When
>the chip comes out of reset, the calibration constant is automatically
>placed in W.  All you have to do is move it to OSCCAL.

Is this true for the 12C67x as well?  The datasheet mentioned nothing of
"automatically loading W after reset".  I suppose it would be easy enough to
verify, although I don't actually have a chip to test with :)

--Andrew

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