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RV5C387A Datasheet(PDF) 27 Page - RICOH electronics devices division

Part No. 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) 27 Page - RICOH electronics devices division

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RV5C387A
1.2-5 Data transmission read format of the RV5C387A
The RV5C387A allows the following three readout methods of data from an internal register.
1) The first method to reading data from the internal register is to specify an internal address by setting the internal
address pointer and the transmission format register described 1.2-4, generate the repeated start condition (see
section 1.2-3) to change the data transmission direction to perform reading. The internal address pointer is set to
Fh when the stop condition is met. Therefore, this method of reading allows no insertion of the stop condition
before the repeated start condition. Set 0h to the transmission format register.
Example 1 of data read (when data is read from 2h to 4h)
S 0 11 0
0
0
1
0
0 01 0
0 0
0
0
A
AAA P
A1
0
Sr
0 01 0
A
1
1
R/W=0 (Write)
Transmission of
slave address
(0110010)
Transmission of
slave address
(0110010)
Setting of
2h to the
internal
address
pointer
Setting of
0h to the
trans-
mission
format
register
Reading of data from
the internal address 2h.
Reading of data from
the internal address 3h.
Reading of data from
the internal address 4h.
Data
Data
Data
Repeated start condition
R/W=1 (Read)
SSr
AA
Master to slave
Slave to master
Start condition
Acknowledge signal
Repeated start condition
P Stop condition
A


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