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RV5C387A Datasheet(PDF) 23 Page - RICOH electronics devices division

Part No. RV5C387A
Description  I2C-bus Real-Time Clock ICs 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) 23 Page - RICOH electronics devices division

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PRELIMINARY
RV5C387A
12345
- 23 -
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 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 used.
1
S
A
A
Data
/A P
Example 2 of data read (when data is read from internal addresses Eh to 1h)
Master to slave
Slave to Master
S
Start Condition
A
A
/A
Acknowledge Signal
Address
Pointer
←Eh
0 1
1
0 0
0
1
Transmission
Format
Register
←4h
1
0
A
Slave Address
← (0110010)
1
0
0 0
0
1
A
Data
A
Data
Reading of data from
the internal address Eh
R/W=0(Write)
P
Stop Condition
Data
Reading of data from
the internal address Fh
Reading of data from
the internal address 0h
Reading of data from
the internal address 1h


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