PIC18452 writing to program memory

[Duane]

I am trying to write sequentially via code to the program memory to store user data. I have not been able to get write_program_eeprom to work. Any help would be appreciated.
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This message was ported from CCS's old forum
Original Post ID: 12190

[Mark]

Are you using an 18F452? Post an example of your code

:=I am trying to write sequentially via code to the program memory to store user data. I have not been able to get write_program_eeprom to work. Any help would be appreciated.
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This message was ported from CCS's old forum
Original Post ID: 12191

[vinothkumar]

I have checked a small program with WRITE_PROGRAM_EEPROM() and READ_PROGRAM_EEPROM() function in 16F877 board. The same program with header file declaration changes and data type changed to 16 bit is not working in PIC18F452. Even the PCB board is same. Just I have interchanged my IC. Any solution from Seniors?????

- Vinoth Kumar
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- Nothing special

[Guest]

http://www.thebytefactory.com

This fellow has 2 bootloaders, one for the 16F877 and one for the 18F452. They are largely the same except for the differences in usage of write_program_eeprom. Download them and look at those differences and you will see how to successfully modify program memory. Basically, the techniques have to be different because the 452 memory has to be erased in blocks and not one at a time when you write it like in the 877. It's actually explained in the CCS manual but is just complicated enough that a good understanding will come from usage.

Good luck