RV5C339A Datasheet, PDF (19/51 Pages) RICOH electronics devices division – 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION

RV5C339A
2.3 Time Counters (at Addresses 0h to 2h)
· 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 “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.
2.3-1 Second Counter (at 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*
2.3-2 Minute Counter (at 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*
2.3-3 Hour Counter (at 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.}
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