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A question about EEPROM features

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Okada

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I am using PIC18F13K22 to make a project. See attached picture ?

What is

EEPROM code protection

and

EEPROM Write protection

EEPROM code protection enabled means I can't write to eeprom in run time but data in eeprom can be used. Right ?

EEPROM Write protection means I can't write to eeprom using programmer and also from code. Right ?

How to use these settings ?

I need to write some flags to eeprom in run time but I don't want anybody to erase the eeprom that is I want eeprom data to be preserved even if chip is erased. How to do this ?
 

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Firstly you are misunderstanding both EEPROM related protection bits.
Code protection means, the EEPROM content can't be read or written by a programmer, only erased in total
Write protection means, it can't be written at run-time (used as read-only memory)
Review the datasheet.

I need to write some flags to eeprom in run time but I don't want anybody to erase the eeprom that is I want eeprom data to be preserved even if chip is erased. How to do this ?
Click to expand...
Makes no sense. A programmer can always erase any part of the microcontroller memory. The only way to preserve the EEPROM content in programmer operation is to instruct the programmer respectively.

If this can't be guaranteed, use an external EEPROM.
 
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