R2025S/D
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.
1
0
h
r.
1
h
r
1
0
m
in
.
1
m
in
.
1
0
h
r
1
h
r.
1
0
m
in
.
1
mi
n.
.
.
.
.
.
WW0 WW1 WW2 WW3 WW4 WW5 WW6
00:00 a.m. on all
days
01:30 a.m. on all
days
11:59 a.m. on all
days
00:00 p.m. on Mon.
to Fri.
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
2
1
1
2
0
3
5
0
0
0
9
0
0
0
1
1
0
0
3
5
0
0
0
9
0
0
1
3
1
1
2
01:30 p.m. on Sun.
11:59 p.m.
1
0
0
1
0
0
0
1
0
0
0
1
0
0
2
3
1
1
3
5
0
9
1
2
3
3
3
5
0
9
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.
• 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
0
DM40
Indefinite
DM20
Indefinite
DM10
Indefinite
DM8
Indefinite
DM4
Indefinite
DM2
Indefinite
DM1
Indefinite
(For Reading)
Default Settings *)
Alarm_D Hour Register (Address Ch)
D7
D6
D5
D4
D3
D2
D1
D0
-
-
DH20
DP⋅/A
DH20
DH10
DH8
DH4
DH2
DH1
(For Writing)
0
0
DH10
DH8
DH4
DH2
DH1
(For Reading)
DP⋅/A
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
0
0
Default Settings *)
*) Default settings: Default value means read / written values when the PON bit is set to “1” due to VDD
power-on from 0 volts.
* 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 "P11 •Control Register 1 (ADDRESS Eh) (2) /12⋅24: 12-/24-hour Mode Selection Bit")
19
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