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RV5C338A Datasheet(PDF) 49 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) 49 Page - RICOH electronics devices division

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R
×5C338A
46
YES
NO
Periodic Interrupt Process
CTFG=1?
Other Interrupt
Processes
Generate Interrupt to CPU
Write “
×,1,×,1,×,0,1,1”
to Control Register 2
Set Periodic Interrupt
Cycle Selection Bits
*
1
*
2
WAFG or DAFG=1?
Generate Interrupt to CPU
WALE or DALE=1
YES
NO
Conduct Alarm Interrupt
WALE or DALE=0
Set Alarm Minute, Hour,
and Day-of-week Registers
Other Interrupt
Processes
Write “
×,1,×,1,×,1,0,1”
to Control Register 2
*
1
*
2
*
3
8.4-2 Alarm Interrupt
8.4 Interrupt Process
8.4-1 Periodic Interrupt
*1) This step is intended to select the level mode as a waveform mode for the
periodic interrupt function.
*2) This step is intended to set the CTFG bit to 0 in the control register 2 to
cancel an interrupt to the CPU.
*1) This step is intended to once disable the alarm interrupt circuit by setting
the WALE and DALE bits to 0 in anticipation of the coincidental occurrence
of a match between current time and preset alarm time in the process of
setting the alarm interrupt function.
*2) This step is intended to enable the alarm interrupt function after completion
of all alarm interrupt settings.
*3) This step is intended to once cancel the alarm interrupt function by writing
the settings of “
×,1,×,1,×,1,0,1” and “×,1,×,1,×,1,1,0” to the Alarm_W
registers and the Alarm_D registers, respectively.


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