Si53156

10

Rev. 1.1

4. Control Registers

Interface initialize to their default setting at power-up. The use of this interface is optional. Clock device register

changes are normally made at system initialization, if any are required. Power management functions can only be

programed in program mode and not in normal operation modes.

4.2. Data Protocol

write/read operation, access the bytes in sequential order from lowest to highest (most significant bit first) with the

ability to stop after any complete byte is transferred. For byte write and byte read operations, the system controller

can access individually indexed bytes.

The block write and block read protocol is outlined in Table 4 on page 10 while Table 5 on page 11 outlines byte

write and byte read protocol. The slave receiver address is 11010110 (D6h).

Table 4. Block Read and Block Write Protocol

Block Write Protocol

Block Read Protocol

Bit

Description

Bit

Description

1

Start

1

Start

8:2

Slave address—7 bits

8:2

Slave address—7 bits

9Write

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