Interfacing code for 89C51 to PCF 8574 to interface LCD in 4bit

hey,
can some1 help me to interface PCF 8574 with 89c51 using I2C bus for interfacing LCD in four but mode please..
its for my final year project it will help me alot if
any1 can help me out for the code..
coz im not able 2 get it done.. i dont understand
it actually..

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