Flash memory erasing on power on/off

[milk3422]

I am compiling and running the example code ex_intfl.c to try and figure out how to use the flash memory on the 18f452.

The code compiles fine and I can run it. I can even select and change the values at memory locations.

My issue is, when I power off my circuit and power it back on all the changes I made to the flash memory have been deleted and all the memory address are reset to 0xFFF!

Maybe I am not understanding the concept of flash memory here.

What I need is to store some data(int, float, char, etc.) in memory that is non volatile. While I read through the 18F452 manual it said the the data EEPROM needs to be refreshed frequently, seeing as how the data I am storing may not change value frequently, I figured flash is where i should be storing data.

What I understand:
-Flash memory is where the actual program that is running on the PIC is being held. Flash is non-volatile.
-Data memory is ram which is used for local variables.
-Data EEPROM is also non-volatile memory that requires frequent refreshes.

Any help would be greatly appreciated. I would really love to know why the information getting written to flash memory is getting deleted.

Thank you!

[PCM programmer]

[milk3422]

Thank you, problem solved!

Now, I know I was sitting down looking at this for way to long!