RS5C348A RICOH Co.,Ltd., RS5C348A Datasheet - Page 43

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

Rev.2.01
(1) Ordinary Process of Reading Time and Calendar Data
(2) Basic Process of Reading Time and Calendar Data with Periodic Interrupt Function
Reading Time and Calendar Data
Generate Interrupt in CPU
Read from Time Counter
Read from Time Counter
and Calendar Counter
Set Periodic Interrupt
and Calendar Counter
Cycle Selection Bits
Control Register 2
←(X1X1X011)
CTFG=1?
CE ← H
CE ← L
Yes
*2)
*3)
*1)
*2)
*1)
No
Other Interrupt
*1) When writing to clock and calendar counters, do not insert Stop Condition
*2) Take care so that process from Start Condition to Stop Condition will be
Processes
until all times from second to year have been written to prevent error in
writing time. (Detailed "P.24
Time Data under special condition
complete within 0.5sec.
Reading and Writing Time Data under special condition
*1) This step is intended to select the level mode as a
*2) This step must be completed within 1.0 second.
*3) This step is intended to set the CTFG bit to 0 in the
- 43 -
waveform mode for the periodic interrupt function.
Control Register 2 to cancel an interrupt to the CPU.
(Detailed in "P.24
Considerations in Reading and Writing
".
Considerations in
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Rx5C348A/B
".