Make sure that you have the correct register map set for the chip
you are using.  I tend to do my debugging on flash chips, then do a
final check on a JW, then program OTP.

Martin

> Hi.  Today I have trashed two 16C711 JW devices.  Although I
> spent a lot of attention to the code protection being set to OFF,
> both chips reported a programming error, namely the CP setting
> "illegal".
>
> Both are now not erasable anymore and ready for the trashcan.
> I ordered another two, and 20 OTP devices just in case I can't
> fix the problem.
>
> Why did MPLAP / Picstart+ programm a part of the bits, although
> I explicitly set CP to off?   I have no config bits defined in
> the source code, I entered the settings manually in the PS+
> programmer window.  I even clicked CP on then off to be sure that
> that MPLAB "touches" the bits and doesn't leave them in an undefined
> previous state.
>
>
> What's wrong?  Am I better off with debugging with OTP chips instead
> of those expensives JWs when I have to toss them away anyway after 1
> use?