RV5C386A-E2 Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RV5C386A-E2

I2C-Bus Real-Time Clock ICs with Voltage Monitoring Function

RICOH Co.,Ltd. 

PRELIMINARY

RV5C386A

(5) SCRATCH2 Scratch Bit 2

SCRATCH2

Description

0

(Default)

1

The SCRATCH2 bit is intended for scratching and accepts the reading and writing of 0 and 1. The SCRATCH2

bit will be set to 0 when the XSTP bit is set to 1 in the Control Register 2.

(6) CTFG

Periodic Interrupt Flag Bit

CTFG

Description

0

Periodic interrupt output = “H”

(Default)

1

Periodic interrupt output = “L”

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.

(7) WAFG,DAFG Alarm_W Flag Bit and Alarm_D Flag Bit

WAFG,DAFG

Description

0

Indicating a mismatch between current time and preset alarm time (Default)

1

Indicating a match between current time and preset alarm time

The WAFG and DAFG bits are valid only when the WALE and DALE 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 (DAFG) bit accepts only the writing of 0. /INTRB (/INTRA) pin

outputs off (“H”) when this bit is set to 0. And /INTRB (/INTRA) pin outputs “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 (/INTRA) pin as shown in the timing

chart below.

Approx. 61µs

Approx. 61µs

WAFG(DAFG) Bit

/INTRB(/INTRA) Pin

Writing of 0 to

WAFG(DAFG) bit

(Match between

(Match between

current time and

current time and

preset alarm time)

preset alarm time)

Writing of 0 to

WAFG(DAFG) bit

(Match between

current time and

preset alarm time)

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