R2025S/D
• Time Counter (Address 0-2h)
Second Counter (Address 0h)
D7
-
D6
S40
D5
S20
D4
S10
D3
S8
D2
S4
D1
S2
D0
S1
(For Writing)
0
0
S40
Indefinite
S20
Indefinite
S10
Indefinite
S8
Indefinite
S4
Indefinite
S2
Indefinite
S1
Indefinite
(For Reading)
Default Settings *)
Minute Counter (Address 1h)
D7
-
0
D6
M40
D5
M20
D4
M10
D3
M8
M8
D2
M4
M4
D1
M2
M2
D0
M1
M1
(For Writing)
(For Reading)
Default Settings *)
M40
M20
M10
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
0
Hour Counter (Address 2h)
D7
D6
D5
D4
D3
D2
D1
D0
-
-
H10
H8
H4
H2
H1
(For Writing)
P⋅/A
or
H20
0
0
H10
H8
H4
H2
H1
(For Reading)
P⋅/A
or
H20
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.
* Time digit display (BCD format) as follows:
The second digits range from 00 to 59 and are carried to the minute digit in transition from 59 to 00.
The minute digits range from 00 to 59 and are carried to the hour digits in transition from 59 to 00.
The hour digits range as shown in "P11 • Control Register 1 (ADDRESS Eh) (2) /12⋅24: /12-24-hour Mode
Selection Bit" and are carried to the day-of-month and day-of-week digits in transition from PM11 to AM12
or from 23 to 00.
* Any writing to the second counter resets divider units of less than 1 second.
* Any carry from lower digits with the writing of non-existent time may cause the time counters to malfunction.
Therefore, such incorrect writing should be replaced with the writing of existent time data.
• Day-of-week Counter (Address 3h)
D7
D6
D5
D4
D3
D2
W4
D1
W2
D0
W1
-
-
-
-
-
(For Writing)
0
0
0
0
0
0
0
0
0
0
W4
Indefinite
W2
Indefinite
W1
Indefinite
(For Reading)
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 day-of-week counter is incremented by 1 when the day-of-week digits are carried to the day-of-month
digits.
*
Day-of-week display (incremented in septimal notation):
(W4, W2, W1) = (0, 0, 0) → (0, 0, 1)→…→(1, 1, 0) → (0, 0, 0)
* Correspondences between days of the week and the day-of-week digits are user-definable
(e.g. Sunday = 0, 0, 0)
*
The writing of (1, 1, 1) to (W4, W2, W1) is prohibited except when days of the week are unused.
15
RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
