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R2023K Datasheet(PDF) 19 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) 19 Page - RICOH electronics devices division

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R2023K/T
19
Alarm_W Registers (Address 8-Ah)
Alarm_W Minute Register (Address 8h)
D7
D6
D5
D4
D3
D2
D1
D0
-
WM40
WM20
WM10
WM8
WM4
WM2
WM1
(For Writing)
0
WM40
WM20
WM10
WM8
WM4
WM2
WM1
(For Reading)
0
Indefi
nite
Indefi
nite
Indefi
nite
Indefi
nite
Indefi
nite
Indefi
nite
Indefi
nite
Default Settings *)
Alarm_W Hour Register (Address 9h)
D7
D6
D5
D4
D3
D2
D1
D0
-
-
WH20
WP/ A
WH10
WH8
WH4
WH2
WH1
(For Writing)
0
0
WH20
WP/ A
WH10
WH8
WH4
WH2
WH1
(For Reading)
0
0
Indefi
nite
Indefi
nite
Indefi
nite
Indefi
nite
Indefi
nite
Indefi
nite
Default Settings *)
Alarm_W Day-of-week Register (Address Ah)
D7
D6
D5
D4
D3
D2
D1
D0
-
WW6
WW5
WW4
WW3
WW2
WW1
WW0
(For Writing)
0
WW6
WW5
WW4
WW3
WW2
WW1
WW0
(For Reading)
0
Indefi
nite
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 of the Alarm_W Hour Register represents WP/ A when the 12-hour mode is selected (0 for a.m.
and 1 for p.m.) and WH20 when the 24-hour mode is selected (tens in the hour digits).
* The Alarm_W 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_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
"P12
•Control Register 1 (ADDRESS Eh) (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.



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