Roman:

I fought something like this once.  The problem ended up being related to
R-M-W on the port pins.  Each time I toggled the CLOCK pin, it would latch
the CURRENT state of the DATA pin (which of course can change when the
slave ACKs.  The solution was to restore the DATA pin after each CLOCK
change.  I suppose using shadow registers might of done it as well.

My (CVASM) source for talking to a 24C00 type device is at:

http://www.tech-tools.com

Click on "search" and search for "i2c"


>Any suggestions? This is embarassing, after all the
>I2C problems posted here I was determined to do my
>homework first and get it right... :o)
>-Roman


Jerry Merrill

jerrym@tech-tools.com
http://www.tech-tools.com
FAX: (972) 494-5814   VOICE:(972) 272-9392
TechTools  PO Box 462101  Garland,  TX  75046-2101

Join our PIC discussion list at
http://www.tech-tools.com/picsource.htm

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads