Real-Time Clock
DS12885/DS12887/DS12887A/DS12C887/DS12C887A
Table 2B. Time, Calendar, and Alarm Data Modes—Binary Mode (DM = 1)
ADDRESS
00H
01H
02H
03H
04H
0
AM/PM
05H
0
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH-31H
32H
33H-7FH
X
X
0
0
0
0
UIP
SET
IRQF
VRT
X
0
0
0
DV2
PIE
PF
0
X
N/A
X
X
X
X
0
0
0
DV1
AIE
AF
0
X
0
0
DV0
UIE
UF
0
X
Year
RS3
SQWE
0
0
X
0
0
0
Hours
0
Date
Month
RS2
DM
0
0
X
N/A
X
X
RS1
24/12
0
0
X
RS0
DSE
0
0
X
Day
Day
Date
Month
Year
Control
Control
Control
Control
RAM
Century*
RAM
BIT 7
0
0
0
0
AM/PM
0
0
Hours
Hours
Hours Alarm
BIT 6
0
0
0
0
0
BIT 5
BIT 4
BIT 3
BIT 2
Seconds
Seconds
Minutes
Minutes
Hours
Hours
BIT 1
BIT 0
FUNCTION
Seconds
Seconds Alarm
Minutes
Minutes Alarm
RANGE
00–3B
00–3B
00–3B
00–3B
01–0C +AM/PM
00–17
01–0C +AM/PM
00–17
01–07
01–1F
01–0C
00–63
—
—
—
—
—
—
—
X = Read/Write Bit.
*DS12C887,
DS12C887A only. General-purpose RAM on DS12885, DS12887, and DS12887A.
Note:
Unless otherwise specified, the state of the registers is not defined when power is first applied. Except for the seconds regis-
ter, 0 bits in the time and date registers can be written to 1, but may be modified when the clock updates. 0 bits should always be
written to 0 except for alarm mask bits.
14
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