RX5C348A Datasheet, PDF (22/45 Pages) RICOH electronics devices division – 4-WIRE SERIAL INTERFACE

Rx5C348A/B
Writing Data Transfer Formats
(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 data
transfer format.
Example of 1-byte Writing Data Transfer (For Writing Data to Addresses Fh and 7h)
CE
SI
11111000
Data
01111000
Data
SO
Specifying FhSetting 8h in
in the
the Transfer
Address
Format
Pointer
Register
Writing data to
address Fh
Specifying 7hSetting 8h in Writing data to
in the
the Transfer
address 7h
Address
Format
Pointer
Register
Data transfer from the host
Data transfer from the RTCs
(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 0h)
CE
SI
11100000
Data
SO
Specifying EhSetting 0h in Writing data to
in the
the Transfer
address Eh
Address
Format
Pointer
Register
Data
Writing data to
address Fh
Data
Writing data to
address 0h
Data transfer from the host
Data transfer from the RTCs
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