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R2023K Datasheet(PDF) 20 Page - RICOH electronics devices division

Part # R2023K
Description  2-wire Serial Interface Real Time Clock IC
PDF  50 Pages
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

R2023K Datasheet(HTML) 20 Page - RICOH electronics devices division

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R2023K/T
20
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.
WW
0
WW
1
WW
2
WW
3
WW
4
WW
5
WW
6
00:00 a.m. on all
days
1
1
1
1
1
1
1
1
2
0
0
0
0
0
0
01:30 a.m. on all
days
1
1
1
1
1
1
1
0
1
3
0
0
1
3
0
11:59 a.m. on all
days
1
1
1
1
1
1
1
1
1
5
9
1
1
5
9
00:00 p.m. on Mon.
to Fri.
0
1
1
1
1
1
0
3
2
0
0
1
2
0
0
01:30 p.m. on Sun.
1
0
0
0
0
0
0
2
1
3
0
1
3
3
0
11:59 p.m.
on Mon. ,Wed.,
and Fri.
0
1
0
1
0
1
0
3
1
5
9
2
3
5
9
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
DM40
DM20
DM10
DM8
DM4
DM2
DM1
(For Reading)
0
Indefinit
e
Indefinit
e
Indefinit
e
Indefinit
e
Indefinit
e
Indefinit
e
Indefinit
e
Default Settings *)
Alarm_D Hour Register (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
Indefi
nite
Indefi
nite
Indefi
nite
Indefi
nite
Indefi
nite
Indefi
nite
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 "P12
•Control Register 1 (ADDRESS Eh) (2) 12 /24: 12 /24-hour Mode Selection Bit")



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