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RV5C387A-E2 Datasheet(PDF) 41 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) 41 Page - RICOH electronics devices division

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PRELIMINARY
RV5C387A
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- 41 -
(3) Applied Process of Reading Time and Calendar Data with Periodic Interrupt Function
Time data need not be read from all the time counters when used for such ordinary purposes as time count indication.
This
applied process can be used to read time and calendar data with substantial reductions in the load involved in such reading.
For Time Indication in "Day-of-Month, Day-of-week, Hour, Minute, and Second"
Format:
*2)
Other interrupts
Processes
Control Register 1
(XXXX0100)
Control Register 2
(X1X1X011)
Sec.=00?
Yes
No
Use Previous Min.,Hr.,
Day,and Day-of-week data
Generate interrupt to CPU
*1)
*3)
CTFG=1?
Control Register 2
(X1X1X011)
Yes
Read Min.,Hr.,Day,
and Day-of-week
*4)
No
*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
sec.
*3) This step is intended to read time data
from all the time counters only in the
first session of reading time data after
writing time data.
*4) 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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