So you were never able to do a bulk erase?
The only thing that removes code protection is a bulk chip erase, IIRC.

-Adam

Anbunathan R wrote:

>Hi,
>Whatever Microchip specification about ICSP is not correct. Especially i want to develop a programmer for Flash controllers like 16F84,16F628 and 16F873. I could succeed in reading, writing,erasing the flash memory and configuration memory. Whereas if i try to protect and unprotect the chip i could n't. I have followed the ICSP specification to do the above function which is given by Microchip. But my time and effort gone waste. Microchip should not do this. I feel Microchip is cheating the engineers by giving a wrong programming spec.
>
>With Regards,
>Anbu
>
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