PIC16F628A Eeprom Write without Erasing Flash Code

[mystery]

Hi All,
I want to write (modify) the eeprom of the PIC16F628A which is code protected. All of the programmers first of all sends the "bulk erase" & erase all locked flash content then updates the eeprom contents. Is there a way to update the eeprom contents without erasing locked flash content.

Thanks all,

 

[wchu01]

Eeprom would allow user to write to its memory without erasing. You might want to refer to the datasheet from Microchip(Pg 17 of 22).

Setting Bit 13 of your Register 3-1 allows you to unprotect the code protection, then you could write to the eeprom as per normal.

 

[mystery]

Thanks for your interest.
Do you know any programmer which do this. Or do I have to implement it myself?

 

[sodaman]

You can not reprogram the eeprom data with the CP turn on without erasing everything. This is taken right from the spec sheet page 91.

"When the device is code-protected, the CPU can
continue to read and write the data EEPROM memory. A
device programmer can no longer access this memory."