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RV5C338A Datasheet(PDF) 47 Page - RICOH electronics devices division

Part No. RV5C338A
Description  3-WIRE SERIAL INTERFACE 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

RV5C338A Datasheet(HTML) 47 Page - RICOH electronics devices division

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×5C338A
44
8.3 Reading Time and Calendar Data
8.3-1 Ordinary Process of Reading Time and Calendar Data
Wait for 31
µs
Read from Time Counter
and Calendar Counter
*
1
8.3-2 Basic Process of Reading Time and Calendar Data Synchronized with Periodic Interrupt
CTFG=1?
Other Interrupt
Processes
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
*1) This step of waiting is detailed in “1.5 Considerations in Reading and
Writing Time Data”.
*1) This step is intended to select the level mode as a waveform mode for the
periodic interrupt function.
*2) If this step is completed within 1 second, the step of waiting described in
“8.3-1 Ordinary Process of Reading Time and Calendar Data” above need
not be conducted. This step is detailed in “1.5 Considerations in Reading
and Writing Time Data”.
*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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