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RV5C387A-E2 Datasheet(PDF) 40 Page - RICOH electronics devices division

Part No. RV5C387A-E2
Description  I2C-bus Real-Time Clock ICs with Voltage Monitoring Function?
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RV5C387A-E2 Datasheet(HTML) 40 Page - RICOH electronics devices division

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RV5C387A
PRELIMINARY
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- 40 -
14.8.3.
Reading Time and Calendar Data
(1) Ordinary Process of Reading Time and Calendar Data
Read from Time Counter
and Calendar Counter
*2)
Start Condition
Start Condition
*1)
(2) Basic Process of Reading Time and Calendar Data with Periodic Interrupt Function
*2)
Other Interrupt
Processes
Set Periodic Interrupt
Cycle Selection Bits
CTFG=1?
Read from Time Counter
and Calendar Counter
Yes
No
Control Register 2
←(X1X1X011)
Generate Interrupt in CPU
*1)
*3)
*1) When writing to clock and calendar counters, do not insert Stop Condition
until all times from second to year have been written to prevent error in
writing time. (Detailed in "14.1.5. Data Transmission under Special
Condition".
*2) Take care so that process from Start Condition to Stop Condition will be
complete within 0.5sec.
(Detailed in "14.1.5. Data Transmission under
Special Condition".
*1) This step is intended to select the level mode as a
waveform mode for the periodic interrupt function.
*2) This step must be completed within 0.5 second.
*3) This step is intended to set the CTFG bit to 0 in the
Control Register 2 to cancel an interrupt to the CPU.


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