W311

......................... Document #: 38-07703 Rev. ** Page 4 of 18

Table 3. Word Read and Word Write Protocol

Word Write Protocol

Word Read Protocol

Bit

Description

Bit

Description

1Start

1Start

2:8

Slave address – 7 bits

2:8

Slave address – 7 bits

9Write

9Write

10

Acknowledge from slave

10

Acknowledge from slave

11:18

Command Code – 8 bits

‘1xxxxxxx’ stands for byte or word operation

bit[6:0] of the command code represents the

offset of the byte to be accessed

11:18

Command Code – 8 bits

‘1xxxxxxx’ stands for byte or word operation

bit[6:0] of the command code represents the

offset of the byte to be accessed

19

Acknowledge from slave

19

Acknowledge from slave

20:27

Data byte low – 8 bits

20

Repeat start

28

Acknowledge from slave

21:27

Slave address – 7 bits

29:36

Data byte high –- 8 bits

28

Read

37

Acknowledge from slave

29

Acknowledge from slave

38

Stop

30:37

Data byte low from slave – 8 bits

38

Acknowledge

39:46

Data byte high from slave – 8 bits

47

NOT acknowledge

48

Stop

Table 4. Byte Read and Byte Write Protocol

Byte Write Protocol

Byte Read Protocol

Bit

Description

Bit

Description

1Start

1Start

2:8

Slave address – 7 bits

2:8

Slave address – 7 bits

9Write

9Write

10

Acknowledge from slave

10

Acknowledge from slave

11:18

Command Code – 8 bits

‘1xxxxxxx’ stands for byte operation

bit[6:0] of the command code represents the

offset of the byte to be accessed

11:18

Command Code – 8 bits

‘1xxxxxxx’ stands for byte operation

bit[6:0] of the command code represents the

offset of the byte to be accessed

19

Acknowledge from slave

19

Acknowledge from slave

20:27

Data byte – 8 bits

20

Repeat start

28

Acknowledge from slave

21:27

Slave address – 7 bits

29

Stop

28

Read

29

Acknowledge from slave

30:37

Data byte from slave – 8 bits

38

Not Acknowledge

39

Stop