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89C51 doesnt have an USB support. You may use FT232 OR CP2102 OR PL2303 or such chips which convert USB to UART which may then be intrefaced to any 8051 micro through its TX RX pins.
thanks for the reply.. i dono whether a microcontroller contains RTS, CTS pin...:-( can u help me? plz send me a circuit diagram if u've..