RS5C372B-E2(1997) View Datasheet(PDF) - RICOH Co.,Ltd.

Part Name

Description

View to exact match

RS5C372B-E2
(Rev.:1997)

I2C-bus Serial Interface Real Time Clock (8pin SSOP)

RICOH Co.,Ltd. 

RS5C372B

1.2.4. Data transmission write format in the RS5C372B

Although the I2C-bus standard defines a transmission format for the slave address allocated for each IC,

transmission method of address information in IC is not defined. The RS5C372B transmits data the

internal address pointer (4bit) and the transmission format register (4bit) at the 1byte next to one which

transmitted a slave address and a write command. For write operation only one transmission format is

available and (0000) is set to the transmission format register. The 3byte transmits data to the address

specified by the internal address pointer written to the 2 byte. Internal address pointer settings are

automatically incremented for 4byte and after. Note that when the internal address pointer is Fh, it will

change to 0h on transmitting the next byte.

Example of data writing (When writing to internal address Eh-Fh)

R/W=0(Write)

S0 1 1 0 0 1 0 0A1 1 1 0 0 0 0 0A

Data

A

Data

AP

Transmission of

slave address

(0110010)

Setting of Eh Setting of 0h

to the Internalto the trans-

Address missionfor-

pointer

mat register

Writing of data to

the Internal

Address Eh

Writing of data to

the Internal

Address Fh

Master to slave

Slave to master

S Start condition

P Stop condition

A A /A Acknowledge

1.2.5. Data transmission read format of the RS5C372B

The RS5C372B allows the following three readout methods of data from internal registers.

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 1.2.4., generate the repeated

start condition (see section 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 the stop condition before the resend start condition. Set 0h to the

transmission format register when this method is used.

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