M38040F2HKP datasheet(224/387 Pages) RENESAS

No. de pieza	M38040F2HKP

Descripción Electrónicos	8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES

PDF	387 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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APPLICATION

2.5 Multi-master I2C-BUS interface

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

(2)

Communication example in master device

The master device follows the procedures ➀ to ➅ shown by Figure 2.5.21.

Additionally, the shaded area in the figure is a transmission data from the master device and the

white area is a transmission data from the slave device.

➀ Generating of START condition; Transmission of slave address + write bit

➁ Transmission of command

➂ Generating of RESTART condition; Transmission of slave address + read bit

➃ Reception of lower data

➄ Reception of upper data

➅ Generating of STOP condition

Figures 2.5.22 to 2.5.27 show the procedures ➀ to ➅.

Fig. 2.5.21 Read Word protocol communication as SMBUS master device

R/W

R/W A

➀

➁➂

➃

➄

➅

Slave address

7 bits

“0”

8 bits7 bits8 bits8 bits

“1”

Slave address

Command

Interrupt request

Interrupt request Interrupt request

Interrupt request

Lower data

Upper data

Master to slave

Slave to master

S: START condition

A: ACK bit

Sr: RESTART condition

P: STOP condition

R/W: Read/Write bit

Write

Read

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