RV5C387A_03 datasheet(39/49 Pages) RICOH

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

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RV5C387A

4.1 Alarm Interrupt

The alarm circuit is controlled by the enable bits (i.e. the WALE and DALE bits in the control register 1) and the

flag bits (i.e. the WAFG and DAFG bits in the control register 2). The enable bits can be used to enable this circuit

when set to 1 and to disable it when set to 0. When intended for reading, the flag bits can be used to monitor alarm

interrupt signals. When intended for writing, the flag bits will cause no event when set to 1 and will drive high

(disable) the alarm circuit when set to 0.

The enable bits will not be affected even when the flag bits are set to 0. In this event, therefore, the alarm circuit will

continue to function until it is driven low (enabled) upon the next occurrence of a match between current time and

preset alarm time.

The alarm function can be set by presetting desired alarm time in the alarm registers (the Alarm_W registers for the

day-of-week digit settings and both the Alarm_W registers and the Alarm_D registers for the hour and minute digit

settings) with the WALE and DALE bits once set to 0 and then to 1 in the control register 1. Note that the WALE

and DALE bits should be once set to 0 in order to disable the alarm circuit upon the coincidental occurrence of a

match between current time and preset alarm time in the process of setting the alarm function.

Interval (1 minute) during which

a match between current time

and preset alarm time occurs

INTRB or INTRC pin

Setting WALE

and DALE

bit to 1

Match between

current time and

preset alarm time

in the day-of-week

and hour settings

Match between

current time and

preset alarm time

in the day-of- week

and hour settings

Match between

current time and

preset alarm time

in the day-of- week

and hour settings

Setting WALE

and DALE

bit to 0

Setting WALE

and DALE

bit to 1

Match between

current time and

preset alarm time

in the day-of-week

and hour settings

Setting WAFG

and DAFG

bit to 0

Setting WALE

and DALE

bit to 1

Setting WALE

and DALE

bit to 0

MAX.61.1

µs

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RV5C387A Datasheet(PDF) 39 Page - RICOH electronics devices division

RV5C387A Datasheet(HTML) 39 Page - RICOH electronics devices division

Similar Part No. - RV5C387A_03

Similar Description - RV5C387A_03

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