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RV5C386A Datasheet(PDF) 40 Page - RICOH electronics devices division

Part No. RV5C386A
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

RV5C386A Datasheet(HTML) 40 Page - RICOH electronics devices division

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RV5C386A
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4.2 Periodic Interrupt
Setting of the periodic selection bits (CT2 to CT0) enables periodic interrupt to the CPU. There are two waveform
modes: pulse mode and level mode. In the pulse mode, the output has a waveform duty cycle of around 50%. In the
level mode, the output is cyclically driven low and, when the CTFG bit is set to 0, the output is set to high (OFF).
Waveform Mode, Cycle and Falling Timing
1) Pulse Mode: 2-Hz and 1-Hz clock pulses are output in synchronization with the increment of the second counter
as illustrated in the timing chart on the next page.
2) Level Mode: periodic interrupt signals are output with selectable interrupt cycle settings of 1 second, 1 minute, 1
hour, and 1 month. The increment of the second counter is synchronized with the falling edge of
periodic interrupt signals. For example, periodic interrupt signals with an interrupt cycle setting of
1 second are output in synchronization with the increment of the second counter as illustrated in
the timing chart on the next page.
3) When the oscillation adjustment circuit is used, the interrupt cycle will fluctuate once per 20 seconds as follows:
Pulse Mode: the “L” period of output pulses will increment or decrement by a maximum of
±3.784ms.
For example, 1-Hz clock pulses will have a duty cycle of 50
±0.3784%
Level Mode: a periodic interrupt cycle of 1 second will increment or decrement by a maximum of
±3.784ms.
CT2
CT1
CT0
Description
Waveform Mode
Interrupt Cycle and Fall Timing
00
0—
Off (“H”)
00
1—
Fixed at low (“L”)
010
Pulse Mode*
1
2Hz (Duty cycle of 50%)
011
Pulse Mode*
1
1Hz (Duty cycle of 50%)
100
Level Mode*
2
Once per 1 second (Synchronized with second counter increment)
101
Level Mode*
2
Once per minute (at 00 seconds of every minute)
110
Level Mode*
2
Once per hour (at 00 minutes and 00 seconds of every hour)
111
Level Mode*
2
Once per month (at 00 hours, 00 minutes, and 00 seconds of first day of every month)
(Default setting)


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