RV5C338A datasheet(25/52 Pages) RICOH | 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION?

Part #	RV5C338A

Description	3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION?

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Manufacturer	RICOH [RICOH electronics devices division]

Direct Link	http://www.ricoh.com

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×5C338A

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1

2

3

4

5

6

7

8

1

2

3

A3

A2

A1

A0

C3

C2

C1

C0

D7

D6

D3

D2

D1

D0

CE

SCLK

SIO

Setting the address

pointer

Setting the transfer

format register

Writing data transfer /

Reading data transfer

1.2 Data Transfer Formats

Data transfer is commenced in the low to high transition of the CE pin input and completed in its high to low

transition. Data transfer is conducted serially in multiple units of 1 byte (8 bits). The former 4 bits are used to

specify in the address pointer a head address with which data transfer is to be commenced from the host. The latter

4 bits are used to select either reading data transfer or writing data transfer and set the transfer format register to

specify an appropriate data transfer format. All data transfer formats are designed to transfer the most significant bit

(MSB) first.

Two types of data transfer formats are available for reading data transfer and writing data transfer each.

1.3 Writing Data Transfer Formats

1.3-1 1-byte Writing Data Transfer Format

The first type of writing data transfer format is designed to transfer 1-byte data at a time and can be selected by

specifying in the address pointer a head address with which writing data transfer is to be commenced and then

writing the setting of 8h to the transfer format register. This 1-byte writing data transfer can be completed by

driving the CE pin low or continued by specifying a new head address in the address pointer and setting the transfer

format.

Example of 1-byte Writing Data Transfer

(For Writing Data to Addresses Fh and 7h)

1 1 1 1 1

0

0 1 1 1

0 0

0

1

Specifying Fh

in the address

pointer

Writing data

to address Fh

Data

Data transfer from the host

Data transfer from the real-time clocks

CE

SIO

Setting 8h

in the transfer

format register

Specifying 7h

in the address

pointer

Writing data

to address 7h

Setting 8h

in the transfer

format register

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RV5C338A Datasheet(PDF) 25 Page - RICOH electronics devices division

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