R2023K datasheet(27/50 Pages) RICOH

27 / 50 page

R2023K/T

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.

Data

/A P

Example 2 of data read (when data is read from internal addresses Eh to 1h)

Master to slave

Slave to Master

Start Condition

Acknowledge Signal

Address

Pointer

←Eh

0 1

0 0

Transmission

Format

←4h

Slave Address

← (0110010)

0 0

Data

Reading of data from

the internal address Eh

R/W=0(Write)

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

The third method to reading data from the internal register is to start reading immediately after writing to the Slave

Address and R/W bit.

Since the Internal Address Pointer is set to Fh by default as described in the first method,

this method is only effective when reading is started from the Internal Address Fh.

Data

/A P

Example 3 of data read (when data is read from internal addresses Fh to 3h)

Master to slave

Slave to master

Start Condition

Acknowledge Signal

Slave Address

← (0110010)

0 1

Data

R/W=1(Read)

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

Reading of data from

the Internal Address 2h

Reading of data from

the Internal Address 3h

R2023K Datasheet(PDF) 27 Page - RICOH electronics devices division

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