Rx5C348A/B
Good Example
Time span of 31µs or more
Any address other than addresses 0h to 6h
permits of immediate reading or writing without
requiring a time span of 31
µs.
CE
SI
SO
Address Pointer
= Fh
Transfer Format
Register = 4h
F4h
DATA
Reading from
Address Fh
(control2)
DATA
Reading from
Address 0h
(sec.)
DATA
Reading from
Address 1h
(min.)
DATA
Reading from
Address 2h
(hr.)
Bad Example (1)
(Where the CE pin is once driven low in the process of reading time data)
31µs or more
31µs or more
CE
SI
SO
Address Pointer
= 0h
Transfer Format
Register = Ch
0Ch
Data
Reading from
Address 0h
(sec.)
14h
Data
Address Pointer
= 1h
Transfer Format
Register = 4h
Reading from
Address 1h
(min.)
Data
Reading from
Address 2h
(hr.)
Bad Example (2)
(Where a time span of less than 31µs is left until the start of the process of writing time data)
Time span of less than 31µs
CE
SI
SO
Address Pointer
= Fh
Transfer Format
Register = 0h
Writing to
Address Fh
(contorl2)
Writing to
Address 0h
(sec.)
Writing to
Address 1h
(min.)
Writing to
Address 2h
(hr.)
F0h
Data
Data
Data
Data
Bad Example (3)
(Where a time span of less than 61µs is left between the adjacent processes of reading time data)
Less than 62µs
CE
SI
SO
Address Pointer
= 0h
Transfer Format
Register = Ch
0Ch
Data
Reading from
Address 0h
(sec.)
0Ch
Data
Address Pointer
= 0h
Transfer Format
Register = Ch
Reading from
Address 0h
(sec.)
0Ch
Data transfer from the host
Data
Data transfer from RTCs
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Rev.2.01
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RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
