CY284108

........................ Document #: 38-07713 Rev. *B Page 4 of 16

Control Registers

Table 3. Block Read and Block Write Protocol

Block Write Protocol

Block Read Protocol

Bit

Description

Bit

Description

1Start

1

Start

8:2

Slave address – 7 bits

8:2

Slave address – 7 bits

9

Write

9

Write

10

Acknowledge from slave

10

Acknowledge from slave

18:11

Command Code – 8 bits

18:11

Command Code – 8 bits

19

Acknowledge from slave

19

Acknowledge from slave

27:20

Byte Count – 8 bits

20

Repeat start

28

Acknowledge from slave

27:21

Slave address – 7 bits

36:29

Data byte 1 – 8 bits

28

Read = 1

37

Acknowledge from slave

29

Acknowledge from slave

45:38

Data byte 2 – 8 bits

37:30

Byte Count from slave – 8 bits

46

Acknowledge from slave

38

Acknowledge

....

Data Byte /Slave Acknowledges

46:39

Data byte 1 from slave – 8 bits

....

Data Byte N –8 bits

47

Acknowledge

....

Acknowledge from slave

55:48

Data byte 2 from slave – 8 bits

....

Stop

56

Acknowledge

....

Data bytes from slave / Acknowledge

....

Data Byte N from slave – 8 bits

....

NOT Acknowledge

....

Stop

Table 4. Byte Read and Byte Write Protocol

Byte Write Protocol

Byte Read Protocol

Bit

Description

Bit

Description

1Start

1Start

8:2

Slave address – 7 bits

8:2

Slave address – 7 bits

9Write

9Write

10

Acknowledge from slave

10

Acknowledge from slave

18:11

Command Code – 8 bits

18:11

Command Code – 8 bits

19

Acknowledge from slave

19

Acknowledge from slave

27:20

Data byte – 8 bits

20

Repeated start

28

Acknowledge from slave

27:21

Slave address – 7 bits

29

Stop

28

Read

29

Acknowledge from slave

37:30

Data from slave – 8 bits

38

NOT Acknowledge

39

Stop