RV5C387A_03 Datasheet, PDF (28/49 Pages) RICOH electronics devices division – I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION

RV5C387A
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 I²C 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).
R/W=0 (Write)
S01100100A11100100A
Data
A
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 Eh
Data
A
Data
A
Data
AP
Reading of data from
the internal address Fh.
Reading of data from
the internal address 0h.
Reading of data from
the internal address 1h.
Master to slave
S Start condition
A A A Acknowledge signal
Slave to master
P Stop condition
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