Its simple

24c04 has following interface line

A0 - not used in 24c04
A1,A2 - hardwired addrees input when multiplple
24c04 used with one uC (ie 51')
- you can connect both og these to gnd
SCL - Serial clock can be connected to any free port pin of P1 or P2 say P1.0

SDA - Serial bi directional data can be connected to any free port pin of P1 or P2 say P1.1

WP - Write Protect Mode pin - use to write protect certain memory area of 24c04
can be connnected to gnd for simple application

You have to generate serial commands using SCL & SDA
. Through these serial command you can perform desired write/read operation on 24c04 internam eeprom memory location. See 24c04 liter for details of these command

Anil