SN8F5708 datasheet(152/204 Pages) SONIX

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SN8F5708 Series

I2C

Datasheet Rev. 2.4

152

22.2

I2C Transfer Modes

The I2C can operate as a master/slave to execute the 8-bit serial data transmission/reception

operation. Thus, the module can operate in one of four modes: Master Transmitter, Master

Receiver, Slave Transmitter and Slave Receiver.

22.2.1 Master Transmitter Mode

The master transmits information to the slave. The serial data is output via SDA while the serial

clock is output on SCL. Data transmission starts via generate a START(S) signal. After the START

signal, the specific address byte of slave device is sent. The address byte includes 7-bit address bit

and an 8th data direction (R/W) bit. The R/W is set “0” to enable the master transmission. In the

following, the master transmits one or more data byte to the slaver. After each data is transmitted,

the master waits for the acknowledge (ACK) from the slave. In the end, the master generates a

STOP (P) signal to terminate the data transmission.

Slave Address

DATA

A/N P

...

DATA

Transmit signal

Receive signal

S = Start status

P = Stop status

A = ACK

N = NACK

W = Write operation

R = Read operation

Interrupt

22.2.2 Master Receiver Mode

The master receives the information from the slave. The serial data input via SDA while the serial

clock output on SCL. Data reception starts via generate a START(S) signal. After the START signal,

the specific address byte of slave device is sent. The address byte includes 7-bit address bit and an

8th data direction (R/W) bit. The R/W is set “1” to enable the master reception. In the following,

the master receives one or more data byte from the slaver. After each data is received, the master

generates the acknowledge (ACK) or not acknowledge (NACK) to the slave via the status of AA bit.

In the end, the master generates a STOP (P) signal to terminate the data transmission.

Slave Address

DATA

A/N P

...

DATA

Transmit signal

Receive signal

S = Start status

P = Stop status

A = ACK

N = NACK

W = Write operation

R = Read operation

Interrupt

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