RX5C348A Datasheet, PDF (23/45 Pages) RICOH electronics devices division – 4-WIRE SERIAL INTERFACE

Rx5C348A/B
Reading Data Transfer Formats
(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.
Example of 1-byte Reading Data Transfer (For Reading Data from Addresses Eh and 2h)
CE
SI
11101100
00101100
SO
Data
Data
Specifying EhSetting Ch in
in the
the Transfer
Address
Format
Pointer
Register
Reading data from
address Eh
Specifying 2hSetting Ch in Reading data from
in the
the Transfer
address 2h
Address
Format
Pointer
Register
Data transfer from the host
Data transfer from the RTCs
(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
SI
11110100
SO
DATA
Specifying FhSetting 4h in _{Reading data from}
in the
the Transfer
address Fh
Address
Format
Pointer
Register
DATA
Reading data from
address 0h
DATA
Reading data from
address 1h
Data transfer from the host
Data transfer from the RTCs
Rev.2.01
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