Understanding I2C - Part 5

A particular sequence of steps are to be followed to perform WRITE operation to EEPROM. Below are the steps.

• Communication starts with START condition
• SDA is pulled low by MASTER when SCL is HIGH

• Followed by START bit the ADDR of the slave is to be sent by MASTER
• ACK has to sent by the SLAVE after receiving it's address
• MASTER has to share the Higher ADDR Byte of EEPROM to which data has to be written
• SLAVE has to send ACK for this Byte
• MASTER has to share the Lower ADDR Byte of EEPROM to which data has to be written
• SLAVE has to send ACK for this Byte
• MASTER then has to send data Byte of data to be written to EEPROM
• SLAVE has to send ACK for this Byte
• If the MASTER wants it might send STOP condition which releases the bus

One important point we notice is that communication happens Byte by Byte between the MASTER and the SLAVE.