Thanks Sean,

I spoke to MChip yesterday and they matched what you said, the 16C771s
don't have an OSCCAL value and can be erased with no OSCCAL problems.
The guy also told me that MChip are going completely to Flash
programming so this will become a non-issue in time.

Ted Mawson
Ted.Mawson@PortfolioPM.com
======================================
Sean Alcorn - Avion Sydney wrote...

 on 17/1/02 2:50 AM, Ted Mawson at Ted.Mawson@PORTFOLIOPM.COM wrote:

> I just ordered some PIC16C771JWs to experiment with.  Can someone give
> me a reference to how to avoid this OSCAL problem / capture the data
and
> write it back when I want to erase and reuse these PICs?  The
> www.microchips.com website returns zilch on a search for 'OSCAL'.

Ted,

As far as I know, the OSCCAL (two Cs) is unique to the 12C, 12CE and
16C505
series chips - ie; the ones that have the internal oscillator. This
value is
written in to the last register in the factory, and the first
instruction is
to move this value into the W register. To use this value, your first
instruction (for these parts) simply needs to be 'OSCCAL' - it is used
to
calibrate the Oscillator.

I could be wrong, but I not think you have anything to worry about with
16C711JW parts as these do not have the internal oscillator and I am not
aware of any other pre-programmed registers that can be erased with the
UV.

It will be interesting to see how Microchip will address this issue on
the
forthcoming 12F series.

Regards,

Sean

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