RV5C387A_03 datasheet(16/49 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]

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RV5C387A

16

WAFG, DAFG

Description

0

Indicating a mismatch between current time and preset alarm time

1

Indicating a match between current time and preset alarm time

2.2-7 WAFG and DAFG

Alarm_W Flag Bit and Alarm_D Flag Bit

(Default setting)

The WAFG and DAFG bits are valid only when the WALE and DALE bits have the setting of 1, which is caused

approximately 61µs after any match between current time and preset alarm time specified by the Alarm_W registers

and the Alarm_D registers. The WAFG and DAFG bits accept only the writing of 0, which disables (“H”) the INTRB

or INTRC pin until it is enabled (“L”) again at the next preset alarm time. Conversely, setting the WAFG and DAFG

bits to 1 causes no event. The WAFG and DAFG bits will have the reading of 0 when the alarm interrupt circuit is

disabled with the WALE and DALE bits set to 0. The settings of the WAFG and DAFG bits are synchronized with

the output of the INTRB and INTRC pins as shown in the timing chart below.

Output Relationships Between the WAFG or DAFG Bit and INTRB, INTRC

Writing of 0 to WAFG

(DAFG) bit

Writing of 0 to WAFG

(DAFG) bit

(Match between current time

and preset alarm time)

(Match between current time

and preset alarm time)

(Match between current time

and preset alarm time)

Settings of WAFG (DAFG) bit

Output of INTRB (INTRC) pin

Approx.61

µs

Approx.61

µs

CTFG

Description

0

Periodic interrupt output “H” (OFF)

1

Periodic interrupt output “L” (ON)

2.2-6 CTFG

Periodic Interrupt Flag Bit

(Default setting)

The CTFG bit is set to 1 when the periodic interrupt signals are output from the INTRA pin (“L”). The CTFG bit

accepts only the writing of 0 in the level mode, which disables (“H”) the INTRA pin until it is enabled (“L”) again in

the next interrupt cycle. Conversely, setting the CTFG bit to 1 causes no event.

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RV5C387A Datasheet(PDF) 16 Page - RICOH electronics devices division

RV5C387A Datasheet(HTML) 16 Page - RICOH electronics devices division

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