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RV5C386A-E2

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

RICOH Co.,Ltd. 

PRELIMINARY

RV5C386A

(Note that any mismatch between current time and preset alarm time specified by the Alarm_W registers may

disable the alarm interrupt circuit.)

* When the 12-hour mode is selected, the hour digits read 12 and 32 for 0 a.m. and 0 p.m., respectively.

(See "13.2. 1. – (2). /12 * 24: 12-/24-hour Mode Selection Bit").

* WW0 to WW6 correspond to W4, W2, and W1 of the day-of-week counter with settings ranging from (0, 0, 0)

to (1, 1, 0).

* WW0 to WW6 with respective settings of 0 disable the outputs of the Alarm_W Registers.

Example of Alarm Time Setting

Alarm

Day-of-week

12-hour mode 24-hour mode

Preset alarm time

Sun. Mon. Tue. Wed. Th. Fri. Sat. 10 1 10 1 10 1 10 1

hr. hr. min. min. hr. hr. min. min.

WW0 WW1 WW2 WW3 WW4 WW5 WW6

00:00 a.m. on all days

1 1 1 1 1 1 1 12000000

01:30 a.m. on all days

1 1 1 1 1 1 1 01300130

11:59 a.m. on all days

1 1 1 1 1 1 1 11591159

00:00 p.m. on Mon. to Fri.

0 1 1 1 1 1 0 32001200

01:30 p.m. on Sun.

1 0 0 0 0 0 0 21301330

11:59 p.m.

0 1 0 1 0 1 0 31592359

on Mon. ,Wed., and Fri.

Note that the correspondence between WW0 to WW6 and the days of the week shown in the above table is only

an example and not mandatory.

13.2.8. Alarm_D Register (Address B-Ch)

• Alarm_D Minute Register (Address Bh)

D7

D6

D5

D4

D3

D2

D1

D0

-

DM40 DM20 DM10 DM8 DM4 DM2 DM1 (For Writing)

0

DM40 DM20 DM10 DM8 DM4 DM2 DM1 (For Reading)

0

Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite Default Settings *)

• Alarm_D Hour Register (Address Ch)

D7

D6

D5

D4

-

-

DH20 DH10

D3

DH8

D2

DH4

D1

DH2

D0

DH1 (For Writing)

DP⋅/A

0

0

DH20 DH10 DH8 DH4 DH2 DH1 (For Reading)

DP⋅/A

0

0

Indefinite Indefinite Indefinite Indefinite Indefinite Indefinite Default Settings *)

*) Default settings: Default value means read/written values when the XSTP bit is set to “1” due to power-on

from 0 volts or supply voltage drop.

* The D5 bit represents DP/A when the 12-hour mode is selected (0 for a.m. and 1 for p.m.) and DH20 when the

24-hour mode is selected (tens in the hour digits).

* The Alarm_D registers should not have any non-existent alarm time settings.

(Note that any mismatch between current time and preset alarm time specified by the Alarm_D registers may

disable the alarm interrupt circuit.)

* When the 12-hour mode is selected, the hour digits read 12 and 32 for 0a.m. and 0p.m., respectively.

(see "13.2.1. (2) /12 * 24: 12-/24-hour Mode Selection Bit").

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