RS5C348A RICOH Co.,Ltd., RS5C348A Datasheet - Page 22

• Manufacturer Part Number: RS5C348A
• Description: 4-wire Serial Interface Real-time Clock
• Manufacturer: RICOH Co.,Ltd.

Rx5C348A/B
Rev.2.01
(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.
CE
SI
SO
(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.
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.
CE
SI
SO
Example of 1-byte Writing Data Transfer (For Writing Data to Addresses Fh and 7h)
Example of Burst Writing Data Transfer (For Writing Data to Addresses Eh, Fh, and 0h)
Writing Data Transfer Formats
12345
Specifying Fh
in the
Address
Specifying Eh
in the
Address
1
1
Pointer
Pointer
1
1
1
1
1
0
Setting 8h in
the Transfer
Setting 0h in
the Transfer
1
0
Format
Format
Register
Register
0
0
Data transfer from the host
0 0
0 0
Data transfer from the host
Writing data to
Writing data to
Data
Data
address Eh
address Fh
Specifying 7h
in the
Address
0
Pointer
Writing data to
1 1
Data
- 22 -
address Fh
1
Setting 8h in
the Transfer
Data transfer from the RTCs
1
Data transfer from the RTCs
Format
Register
0 0 0
Writing data to
Writing data to
Data
Data
address 7h
address 0h
The address pointer is