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i have one external buffer to store the input values .while processing i need to read the input values from that buffer to my Winbond controller in Port(P0)
how can i read this external buffer?
Actually accessing your external xdata memory is identical to accessing internal xdata memory. It's just a question of memory address.
I presume that you mean EEPROM. Look at sample code for I2C communication (either Keil examples available with the compiler, or application notes from your chip manufacturer). Also look at the Code Architect for generating a skeleton code.