Slave Operation in 7-Bit Addressing Modes

The upper seven bits of an address byte are used to determine a slave’s address, while the LSb of the address byte is reserved as the Read/not Write (R/W) bit. When R/W is set (R/W = 1), the master device intends to read data from the slave. When R/W is clear (R/W = 0), the master device intends to write data to the slave. When an address match occurs, the R/W bit is copied to the Read Information (R) bit, and the 7-bit address is copied to I2CxADB0.