RS5C348A RICOH Co.,Ltd., RS5C348A Datasheet - Page 23

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

Rev.2.01
(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 selecting this
type of reading data Transfer Format.
CE
SI
SO
(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.
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.
CE
SI
SO
Example of 1-byte Reading Data Transfer (For Reading Data from Addresses Eh and 2h)
Example of Burst Reading Data Transfer (For Reading Data from Addresses Fh, 0h, and 1h)
Reading Data Transfer Formats
Specifying Eh
in the
Address
Specifying Fh
in the
Address
1
1
Pointer
Pointer
1
1
1
1
0
1
Setting Ch in
the Transfer
Setting 4h in
the Transfer
1
0
Format
Format
Register
Register
1
1
0 0
0 0
Data transfer from the host
Data transfer from the host
Reading data from
Reading data from
DATA
Data
address Fh
address Eh
Specifying 2h
in the
Address
0
Pointer
Reading data from
0 1
DATA
- 23 -
0
address 0h
Setting Ch in
the Transfer
1
Data transfer from the RTCs
Data transfer from the RTCs
Format
Register
1 0 0
Reading data from
Reading data from
DATA
Data
address 2h
address 1h
The address pointer is
12345
Rx5C348A/B