RV5C339A Datasheet, PDF (27/51 Pages) RICOH electronics devices division – 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION

RV5C339A
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)
CE
SIO
11110100
Data
Specifying Fh Setting 4h
in the address in the transfer
pointer
format register
Reading data
from address Fh
Data
Reading data
from address 0h
Data
Reading data
from address 1h
Data transfer from the host
Data transfer from the real-time clocks
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)
CE
SIO
11111100
Data
11111000
Data
Specifying Fh Setting Ch
in the address in the transfer
pointer
format register
Reading data
from address Fh
Specifying Fh Setting 8h
in the address in the transfer
pointer
format register
Writing data
to address Fh
Data transfer from the host
Data transfer from the real-time clocks
The reading and writing data transfer formats correspond to the settings in the transfer format register as shown in
the table below.
Writing data transfer
(for writing to real-time clock)
Reading data transfer
(for reading from real-time clock)
1-byte transfer
8h
(1,0,0,0)
Ch
(1,1,0,0)
Burst (Successive) transfer
0h
(0,0,0,0)
4h
(0,1,0,0)
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