R2025S/D
Example 1 of Data Read (when data is read from 2h to 4h)
R/W=0(Write)
Repeated Start Condition
R/W=1(Read)
S 0 1 1 0 0 1 0 0 A 0 0 1 0 0 0 0 0 A Sr 0 1 1 0 0 1 0 1 A
Address Transmission
Slave Address
← (0110010)
Slave Address
← (0110010)
Pointer←2h Format
Register←0h
Data
Data
Data
A
A
/A P
Reading of data from Reading of data from Reading of data from
the internal address 2h
the internal address 3h
the internal address 4h
Master to slave
Start Condition
Slave to master
Repeated Start
Condition
Stop Condition
S
A
Sr
P
Acknowledge signal
A
/A
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 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 used.
Example 2 of data read (when data is read from internal addresses Eh to 1h)
R/W=0(Write)
Data
S 0 1 1 0 0 1 0 0 A 1 1 1 0 0 1 0 0 A
A
Address
Pointer
Transmission
Format
Slave Address
(0110010)
Reading of data from
the internal address Eh
←
Eh
←
Register←4h
Data
Data
Data
A
A
/A P
Reading of data from Reading of data from Reading of data from
the internal address Fh
the internal address 0h
the internal address 1h
Master to slave
Start Condition
Slave to Master
Stop Condition
S
A
P
Acknowledge Signal
A
/A
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RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
