RV5C387A-E2 datasheet(21/42 Pages) RICOH

Part #	RV5C387A-E2

Description	I2C-bus Real-Time Clock ICs with Voltage Monitoring Function?

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Manufacturer	RICOH [RICOH electronics devices division]

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PRELIMINARY

RV5C387A

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- 21 -

14.1.3.

Data Transmission Write Format in the RV5C387A

Although the I

2C-Bus standard defines a transmission format for the slave allocated for each IC, transmission

method of address information in IC is not defined. The RV5C387A transmits data the internal address

pointer (4bit) and the Transmission Format Register (4bit) at the 1byte next to one which transmitted a Slave

Address and a write command.

For write operation only one transmission format is available and (0000) is

set to the Transmission Format Register.

The 3byte transmits data to the address specified by the internal

address pointer written to the 2byte.

Internal address pointer setting are automatically incremented for

4byte and after.

Note that when the internal address pointer is Fh, it will change to 0h on transmitting the

next byte.

1

A

S

0

A

Data

A

Data

A P

Example of data writing (When writing to internal address Eh to Fh)

Master to slave

Slave to master

S

Start Condition

P

Stop Condition

A

/A

Acknowledge signal

Address

Pointer

←Eh

R/W=0(Write)

Slave Address

←(0110010)

1

0

0 0 0

0

1 1

1

Transmission

Format

Register

←

0h

Writing of data to the

internal address Fh

Writing of data to the

internal address Eh

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RV5C387A-E2 Datasheet(PDF) 21 Page - RICOH electronics devices division

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Similar Part No. - RV5C387A-E2

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