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RV5C387A-E2 Datasheet(PDF) 14 Page - RICOH electronics devices division

Part No. RV5C387A-E2
Description  I2C-bus Real-Time Clock ICs with Voltage Monitoring Function?
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RV5C387A-E2 Datasheet(HTML) 14 Page - RICOH electronics devices division

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RV5C387A
PRELIMINARY
12345
- 14 -
13.2.3.
Time Counter (Address 0-2h)
Second Counter (Address 0h)
D7
D6
D5
D4
D3
D2
D1
D0
-
S40
S20
S10
S8
S4
S2
S1
(For Writing)
0
S40
S20
S10
S8
S4
S2
S1
(For Reading)
0
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Default Settings *)
Minute Counter (Address 1h)
D7
D6
D5
D4
D3
D2
D1
D0
-
M40
M20
M10
M8
M4
M2
M1
(For Writing)
0
M40
M20
M10
M8
M4
M2
M1
(For Reading)
0
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Indefinite
Default Settings *)
Hour Counter (Address 2h)
D7
D6
D5
D4
D3
D2
D1
D0
-
-
P
⋅/A
or H20
H10
H8
H4
H2
H1
(For Writing)
0
0
P
⋅/A
or H20
H10
H8
H4
H2
H1
(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.
*
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 "13.2.1. – (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.
13.2.4.
Day-of-week Counter (Address 3h)
D7
D6
D5
D4
D3
D2
D1
D0
-
-
-
-
-
W4
W2
W1
(For Writing)
0
0
0
0
0
W4
W2
W1
(For Reading)
0
0
0
0
0
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 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.


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