RV5C339A datasheet(27/51 Pages) RICOH | 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION???

Part No.	RV5C339A

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

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Manufacturer	RICOH [RICOH electronics devices division]

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RV5C339A

24

1.4-2 Burst Reading Data Transfer Format

The second type of reading data transfer format is designed to transfer a sequence of data serially and can be

selected by specifying in the address pointer a head address with which reading data transfer is to be commenced

and then writing the setting of 4h to the transfer format register. The address pointer is incremented for each

transfer of 1-byte data and cycled from Fh to 0h. This burst reading data transfer can be completed by driving the

CE pin low.

Example of Burst Reading Data Transfer

(For Reading Data from Addresses Fh, 0h, and 1h)

1 1 1 1 0

0

1

Specifying Fh

in the address

pointer

Reading data

from address Fh

Reading data

from address 0h

Data

Data transfer from the host

Data transfer from the real-time clocks

CE

SIO

Setting 4h

in the transfer

format register

Reading data

from address 1h

1 1 1 1 1

0

1

Specifying Fh

in the address

pointer

Reading data

from address Fh

Data transfer from the host

Data transfer from the real-time clocks

CE

SIO

Setting Ch

in the transfer

format register

Setting 8h

in the transfer

format register

Specifying Fh

in the address

pointer

Writing data

to address Fh

Data

1 1 1 1 1

0

1.4-3 Combination of 1-byte Reading and Writing Data Transfer Formats

The 1-byte reading and writing data transfer formats can be combined together and further followed by any other

data transfer format.

Example of Combination of 1-byte Reading and Writing Data Transfer

(For Reading and Writing Data from and to

Address Fh)

The reading and writing data transfer formats correspond to the settings in the transfer format register as shown in

the table below.

1-byte transfer

Burst (Successive) transfer

Writing data transfer

8h

0h

(for writing to real-time clock)

(1,0,0,0)

(0,0,0,0)

Reading data transfer

Ch

4h

(for reading from real-time clock)

(1,1,0,0)

(0,1,0,0)

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RV5C339A Datasheet(PDF) 27 Page - RICOH electronics devices division

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