sergio zweedijk wrote:
>
> Hi
> I need some information about the comunication between pic 16c74 and the
> eeprom 24lc256 by the I2C bus.
> thanks

Hello Sergio - -
Here are some links that may help:

Prof. Peter Anderson has a PIC/I2C demo/tutorial at:
http://www.phanderson.com/PIC/16C84/24lc65.html

Microchip application notes AN567 & AN572 give guidance & source code:
http://www.microchip.com/10/Appnote/Category/EEPROMS/index.htm

And here is the needed 24LC256 data sheet:
http://www.microchip.com/Download/Lit/Memory/IC/64to128/21203f.pdf

If you change MCUs, Prof. Anderson has BASIC Stamp code, and
Microchip has 68HC11 code.  Just yesterday I changed the BS2 code to
use a 24LC01 with no problems.

Good luck,
 - Nick -