M38047F9HKP datasheet(222/387 Pages) RENESAS

No. de pieza	M38047F9HKP

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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2-98

APPLICATION

2.5 Multi-master I2C-BUS interface

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

2.5.6 SMBUS communication usage example

This clause explains a SMBUS communication control example using the I2C-BUS. This is a control example

as the master device and the slave device in the Read Word protocol of SMBUS protocol.

The following is a communication example of the “Voltage () command” of the Smart battery data.

Communication specifications:

•Communication frequency = 100 kHz

•Slave address of itself, battery, = “0001011X2” (X means the read/write bit)

•Slave address of communication destination, host, = “0001000X2” (X means the read/write bit)

•Voltage () command = “0916”

•Voltage value of acknowledgment = “2EE016” (12000 mV)

•The communication process is performed in the interrupt process. However, the main process performs

an occurrence of the first START condition and a slave address set.

•A communication buffer is established. Data transfer between the main process and the interrupt process

is performed through the communication buffer.

(1)

Initial setting

Figure 2.5.20 shows an initial setting example using SMBUS communication.

M38047F9HKP Datasheet(PDF) 222 Page - Renesas Technology Corp