RV5C339A Datasheet, PDF (26/51 Pages) RICOH electronics devices division – 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION

RV5C339A
1.3-2 Burst Writing Data Transfer Format
The second type of writing 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 writing data transfer is to be commenced
and then writing the setting of 0h 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 writing data transfer can be completed by driving the
CE pin low.
Example of Burst Writing Data Transfer (For Writing Data to Addresses Eh, Fh, and Oh)
CE
SIO
11100000
Data
Specifying Eh Setting 0h
in the address in the transfer
pointer
format register
Writing data
to address Eh
Data
Writing data
to address Fh
Data
Writing data
to address 0h
Data transfer from the host
Data transfer from the real-time clocks
1.4 Reading Data Transfer Formats
1.4-1 1-byte Reading Data Transfer Format
The first type of reading 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 reading data transfer is to be commenced and then the
setting of writing Ch to the transfer format register. This 1-byte reading 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 Reading Data Transfer (For Reading Data from Addresses Eh and 2h)
CE
SIO
11101100
Data
00101100
Data
Specifying Eh Setting Ch
in the address in the transfer
pointer
format register
Reading data
from address Eh
Specifying 2h Setting Ch
in the address in the transfer
pointer
format register
Reading data
from address 2h
Data transfer from the host
Data transfer from the real-time clocks
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