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RV5C387A Datasheet(PDF) 26 Page - RICOH electronics devices division

Part # RV5C387A
Description  I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RV5C387A Datasheet(HTML) 26 Page - RICOH electronics devices division

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RV5C387A
26
1.2-4 Data transmission write format in the RV5C387A
Although the I
2C bus standard defines a transmission format for the slave address 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 settings 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.
Example of data writing (When writing to internal address Eh to Fh)
S 0 11 0
0
0
1
0
1 11 0
0 0
0
0
AA
A
P
A
R/W=0 (Write)
Transmission of
slave address
(0110010)
Setting of
Eh to the
internal
address
pointer
Setting of
0h to the
trans-
mission
format
register
Writing of data to the
internal address Eh.
Writing of data to the
internal address Fh.
Data
Data
S
AA
Master to slave
Start condition
Acknowledge signal
A
P
Slave to master
Stop condition


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