Perhaps you might try to erase the chips first.

I think that CP0 and CP1 are code protect bits, but I'm not sure.

Hope this helps,
Andrew

On Sat, 22 Jan 2000 18:21:21 -0500 Lou <lfaustini@ATLANTECH.NET> writes:
> Help!
>
>   Whenever I program a 16f877 (40 pin dip) with the following code,
> the chip
> NEVER can be re-programmed again. (well, at least with my picstart
> plus
> anyway). Can anyone help shed some light on what might be happening?
>  I was
> __trying to put some initial values in the chips EEprom, while
> programming
> in MPlab, using hi-tec's C compiler. Now I have 3 dead $10 chips --
> all with
> working  (but not quite finished) code, that I cant re-program over.
> What
> have I done?
>
> #asm
> psect absdata,abs,ovrld,delta=2
> org 0x2100
> dw 00,02,03,04
> #endasm
>
> I have the following config fuses set,
>
>
> __CONFIG(BKBUG|CP1|CP0|WRT|BODEN|PWRTE|WDTE|FOSC1|LVP);
>
>
> Any ideas?
>
>    thanks!
>
>   lfaustini@atlantech.net

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