Si53112

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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Rev. 1.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • September 2, 2021

4.2. Block Read/Write

4.2.1. Block Read

After the slave address is sent with the R/W condition bit set, the command byte is sent with the MSB = 0. The

slave acknowledges the register index in the command byte. The master sends a repeat start function. After the

slave acknowledges this, the slave sends the number of bytes it wants to transfer (>0 and <33). The master

acknowledges each byte except the last and sends a stop function.

Figure 10. Block Read Protocol

4.2.2. Block Write

After the slave address is sent with the R/W condition bit not set, the command byte is sent with the MSB = 0. The

lower seven bits indicate the register at which to start the transfer. If the command byte is 00h, the slave device will

be compatible with existing block mode slave devices. The next byte of a write must be the count of bytes that the

master will transfer to the slave device. The byte count must be greater than zero and less than 33. Following this

byte are the data bytes to be transferred to the slave device. The slave device always acknowledges each byte

received. The transfer is terminated after the slave sends the Ack and the master sends a stop function.

Figure 11. Block Write Protocol

Slave

T

Wr

A Command Code

Command

starT

Condition

Block Read Protocol

Acknowledge

repeat starT

Register # to

read

2 x 7 bit = 1

17

1 1

8

Master to

Slave to

Slave

A

Rd

A r

11

7

1

1

Data Byte A Data Byte 0 A Data Byte 1 N P

8

1

81

81 1

Not acknowledge

stoP Condition

Slave Address

T

Wr

A

Command

Command bit

starT

Condition

Block Write Protocol

Acknowledge

Register # to

write

2 x 7 bit = 0

17

1 1

8

Master to

Slave to

A

1

Data Byte 0 A Data Byte 1 A P

18

1

8

1 1

stoP Condition

Byte Count = 2 A

8