Thanks Dwayne,

> MPLAB will NOT alter the value of the calibration registers if they
> contain
> valid data.  The following is a copy/paste of the replies I received
> from
> David Otten of Microchip.  He is apparently the person responsible for
> writing the 12f675-specific portions of MPLAB.

> Thanks for the feedback. The programmers and ICD won't support changes
> to
> the oscillator and bandgap calibration bits. They're always restored to
> their factory settings after programming. Since the older EPROM devices
> needed to be UV erased, the calibration windows were required which
> isn't
> the case for the flash parts.

Until your post, I thought I may have killed (or at least wounded) one
of my brave little soldiers. After reading your post, I put a new
PIC12F675 in my programmer and read the data. The value of the last
register (which I think is 3FFh) was 3478. I then put the original one
I programmed in and read the data and the value was 3480. A third one
produced 3484, a fourth one 3488 etc.

So what David Otten is saying is that this is no longer an issue. It's
a no-brainer? No matter what I do in MPLAB, it is not possible to
delete that data?

What if you change the "End Address" when programming? Would this do it?

This is great news. I was disappointed when I found that I had lost the
data in my expensive /JW parts. :-(

Thanks again,

Regards,

Sean Alcorn

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