3886 datasheet(213/380 Pages) RENESAS

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3886 Group User’s Manual

APPLICATION

2.5 Multi-master I2C-BUS interface

(3)

Communication example in slave device

The slave device follows the procedures ➀ to ➅ shown by Figure 2.5.25.

The only difference from the master device’s communication is an occurrence of interrupt request

after detection of STOP condition.

➀ Reception of START condition; Transmission of ACK bit due to slave address correspondence

➁ Reception of command

➂ Reception of RESTART condition; Reception of slave address + read bit

➃ Transmission of lower data

➄ Transmission of upper data

➅ Reception of STOP condition

Figures 2.5.26 to 2.5.31 show the procedures ➀ to ➅.

Fig. 2.5.25 Communication example as slave device

R/W

R/W A

Master to slave

Slave to master

S: START condition

A: ACK bit

Sr: RESTART condition

P: STOP condition

R/W: Read/Write bit

➀

➁➂

➃

➄ ➅

Slave address

7 bits

“0”

8 bits7 bits

8 bits8 bits

“1”

Slave address

Command

Interrupt request

Lower data

Upper data

Interrupt re

Write

Read

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