R2023K datasheet(24/50 Pages) RICOH

24 / 50 page

R2023K/T

(3) Data Transmission Format in I

2C-Bus

2C-Bus has no chip enable signal line. In place of it, each device has a 7bit Slave Address allocated. The first

1byte is allocated to this 7bit address and to the command (R/W) for which data transmission direction is

designated by the data transmission thereafter.

7bit address is sequentially transmitted from the MSB and 2 and

after bytes are read, when 8bit is “H” and when write “L”.

The Slave Address of the R2023K/T is specified at (0110010).

At the end of data transmission / receiving, Stop Condition is generated to complete transmission. However, if start

condition is generated without generating Stop Condition, Repeated Start Condition is met and transmission /

receiving data may be continue by setting the Slave Address again. Use this procedure when the transmission

direction needs to be change during one transmission.

Data

/A P

Data is written to the slave

from the master

Slave Address

Data

A P

W hen data is read from the

slave immediately after 7bit

addressing from the master

Master to slave

Slave to master

Sr Repeated Start Condition

Stop Condition

/A Acknowledge Signal

R/W =1(Read)

(0110010)

Inform read has been completed by not generate

an acknowledge signal to the slave side.

Data

R/W=0(Write)

(0110010)

W hen

the

transmission

direction is to be changed

during transmission.

R/W=0(Write)

Data

R/W =1(Read)

(0110010)

/A P

Inform read has been completed by not generate

an acknowledge signal to the slave side.

Data

Start Condition

(0110010)

Slave Address

Salve Address

Slave Address

Data

R2023K Datasheet(PDF) 24 Page - RICOH electronics devices division

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