EEPROM/DATA problem with 18F2523

[JohnM]

I'm using PBP 2.50A, MCS V3.0.0.5 and MPASM V5.14 and an 18F2523.

Every time use DATA or EEPROM to write to a byte in an odd position (1,3,5, etc.), the next byte gets overwritten with $00. For example:

EEPROM 1,[$01] results in...
Address $01 = $01
Address $02 = $00

If I use EEPROM 2,[$01] then all is OK...
Address $02 = $01
Address $03 = (unchanged)

I've read the other threads regarding the 18F fixes. But as far as I can tell, the 18F2523 still has a problem. Has anyone else seen this one or, even better, have a workaround? I've tried everything I can think of.

Thanks!

[Acetronics2]

Hi,

That's quite normal ...

see here :

http://www.picbasic.co.uk/forum/show...=18F452+EEPROM

Alain

[JohnM]

Thanks for that link Alain! I missed that thread.

I was so sure that EEPROM only wrote a single byte at a time because of the "Only the least significant byte of numeric values are stored" line from the PBP manual. I never thought that PBP and the PIC itself would do things differently. Silly me.

Time to hit the PIC18F reference manual to get all of the gory details...ugh.

Thanks again,
John