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RV5C387A Datasheet(PDF) 22 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) 22 Page - RICOH electronics devices division

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RV5C387A
PRELIMINARY
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- 22 -
14.1.4.
Data transmission read format of the RV5C387A
The RV5C387A allows the following three readout method of data 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 14.1.3, generate the Repeated
Start Condition (See section 14.1.2-(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 Stop Condition before the Repeated Start Condition.
Set 0h to the
Transmission Format Register when this method used.
1
S
0
A
A
Data
/A P
Example 1 of Data Read (when data is read from 2h to 4h)
Master to slave
Slave to master
S
Start Condition
Sr
Repeated Start
Condition
A
A
/A
Acknowledge signal
Address
Pointer
←2h
Repeated Start Condition
0
1
0
0
0
1
1
0 0 0
0
0
0
1
Transmission
Format
Register
←0h
Sr
1
0
A
Slave Address
← (0110010)
1
0
0 0
0
1
A
Data
A
Data
Reading of data from
the internal address 3h
R/W=1(Read)
R/W=0(Write)
P
Stop Condition
Slave Address
← (0110010)
Reading of data from
the internal address 4h
Reading of data from
the internal address 2h


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