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RV5C387A Datasheet(PDF) 48 Page - RICOH electronics devices division

Part No. RV5C387A
Description  I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC 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 Datasheet(HTML) 48 Page - RICOH electronics devices division

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RV5C387A
48
8.3-3 Applied Process of Reading Time and Calendar Data Synchronized with Periodic Interrupt
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.
CTFG=1?
Generate Interrupt to CPU
Write
×,×,×,×,0,1,0,0
to Control Register 1
Write
×,1,×,1,×,0,1,1
to Control Register 2
NO
YES
NO
YES
Write
×,1,×,1,×,0,1,1
to Control Register 2
Use Previous Minute,
Hour, Day-of-week,
and Day-of-month Data
Other Interrupt
Processes
Read Minute, Hour, Day-of-week,
and Day-of-month Counters
*
1
*
2
*
4
*
3
Second Digit = 00?
For Time Indication in “Day-of-month, Day-of-week, Hour,
Minute, and Second” Format:
*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 0.5sec.
*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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