>
> I inserted some 10 uS delay between SDA and SCL lines changing the
> state. Still no success.
>

Like everyone else has said, this is most likely a read-modify-write
issue. Use a register as a "latch" like on the 18F series. As in:

portclatch  equ  0x??

       bcf portclatch,scl
       bcf portclatch,sda

       movf portclatch,w
       movwf portc

Use the register as you would PORTC in your code, but remember to move
it to the actual PORTC after you're done making changes.

> I have a 16F676 @ 4MHz communicating with 24LC256 using RC1 (SDA, with
> 1K pull up) and RC2 (SCL).
>

Any reason for 1K? Do you need the speed? You can probably use a
bigger resistor like 10K or 22K and not have to sink so much current
when you pull the line down.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist