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RV5C387A Datasheet(PDF) 47 Page - RICOH electronics devices division

Part # 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) 47 Page - RICOH electronics devices division

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RV5C387A
8.3 Reading Time and Calendar Data
8.3-1 Ordinary Process of Reading Time and Calendar Data
Stop condition
Start condition
Read from clock and
calendar counters
*
1
*
2
8.3-2 Basic Process of Reading Time and Calendar Data Synchronized with Periodic Interrupt
CTFG=1?
Generate Interrupt in CPU
Write
×,1,×,1,×,0,1,1
to Control Register 2
Set Periodic Interrupt
Cycle Selection Bits
YES
NO
Read from Time Counter
and Calendar Counter
*
1
*
2
*
3
Other Interrupt
Processes
*1) When reading from clock and calendar counters, do not insert stop
condition until all times from second to year have been read to prevent
error in reading time. (Detailed in “1.2-6 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 “1.2-6 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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