[WizardOfAz]

Anybody that knows how to do it want to summarize how to read and write the EEPROM on the 18F8520?

There are some functions in the C18 libraries for EE access, but looks like they use I2C and I don't thinks that's needed for the on-chip EEPROM. The compiler also has provision for declaring variables in EEPROM (the rom storage qualifier) and says it generates the TBLWT instruction to write to it, but warns that there may be more code than that requires. Indeed, the 18F8520 data sheet gives all the details, using special regs EECON1, EECON1, TABLAT and TBLPTR. So do we drop into assembly to use EEPROM or is there some library support for it? Anybody want to provide the functions?

EDIT: it's actually EECON1, EECON2, EEDATA, EEADRH, EEADR that are used for EEPROM access. The regs noted above are for accessing program flash memory.

Also - the data sheet says we have 1024 bytes of EEPROM. Why does IFI say we only have 255 bytes? Is the rest of it reserved for their use or is it a typo or what?

Thanks for any help.

Bill Bennett