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RV5C387A Datasheet(PDF) 28 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) 28 Page - RICOH electronics devices division

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RV5C387A
28
2) The second method to reading data from the internal register is to start reading immediately after writing to the
internal address pointer and the transmission format register. Although this method is not based on the I
2C bus
standard in a strict sense it still effective to shorten read time to ease load to the master. Set 4h to the
transmission format register when this method is used.
Example 2 of data read (when data is read from internal addresses Eh to 1h).
S 0 11 0
0
0
1
0
1 11 0
0 0
1
0
A
A
SP
AA
AA P
AA
R/W=0 (Write)
Transmission of
slave address
(0110010)
Setting of
Eh to the
internal
address
pointer
Setting of
4h to the
trans-
mission
format
register
Reading of data from
the internal address Fh.
Master to slave
Slave to master
Start condition
Acknowledge signal
Stop condition
Reading of data from
the internal address 0h.
Reading of data from
the internal address 1h.
Reading of data from
the internal address Eh
A
Data
Data
Data
Data


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