RV5C339A_03 Datasheet, PDF (20/46 Pages) RICOH electronics devices division – 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION

RV5C339A
Example of Alarm Time Setting
Day-of-week
12-hour mode
24-hour mode
Preset alarm time
Sun. Mon. Tue. Wed. Thu. Fri. Sat.
10-hour 1-hour 10-min 1-min 10-hour 1-hour 10-min 1-min
WW0 WW1 WW2 WW3 WW4 WW5 WW6
00:00 a.m. on all days
111111112000000
01:30 a.m. on all days
111111101300130
11:59 a.m. on all days
111111111591159
00:00 p.m. on
Mondays to Fridays
011111032001200
01:30 p.m. on Sundays 1 0 0 0 0 0 0 2 1 3 0 1 3 3 0
11:59 p.m. on Mondays,
010101031592359
Wednesdays, and Fridays
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.
2.8 Alarm_D Register (at Address Bh and Ch)
2.8-1 Alarm_D Minute Register (at 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*
2.8-2 Alarm_D Hour Register (at Address Ch)
D7
D6
D5
D4
D3
D2
D1
D0
—
— DH20,DP/A DH10
DH8
DH4
DH2
DH1 (For writing)
0
0
DH20,DP/A DH10
DH8
DH4
DH2
DH1 (For reading)
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 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 “2.1-2
12/24: 12-/24-hour Mode Selection Bit”).
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