DS12885_10 Datasheet, PDF (14/22 Pages) Maxim Integrated Products – Real-Time Clocks

Real-Time Clocks
Table 2B. Time, Calendar, and Alarm Data Modes—Binary Mode (DM = 1)
ADDRESS
00H
01H
02H
03H
04H
BIT 7
0
0
0
0
AM/PM
0
BIT 6
0
0
0
0
0
BIT 5
0
BIT 4
0
BIT 3 BIT 2
Seconds
Seconds
Minutes
Minutes
BIT 1
Hours
Hours
BIT 0
FUNCTION
Seconds
Seconds Alarm
Minutes
Minutes Alarm
Hours
RANGE
00–3B
00–3B
00–3B
00–3B
01–0C +AM/PM
00–17
AM/PM
05H
0
0
0
0
Hours
Hours
Hours Alarm
01–0C +AM/PM
00–17
06H
0
0
0
0
07H
0
0
0
08H
0
0
0
0
0
Day
Date
Month
09H
0
Year
0AH
UIP
DV2 DV1
DV0
RS3
RS2 RS1 RS0
0BH
SET
PIE AIE
UIE
SQWE DM 24/12 DSE
0CH
IRQF
PF
AF
UF
0
0
0
0
0DH
VRT
0
0
0
0
0
0
0
0EH-31H
X
X
X
X
X
X
X
X
32H
N/A
N/A
33H-7FH
X
X
X
X
X
X
X
X
Day
Date
Month
Year
Control
Control
Control
Control
RAM
Century*
RAM
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.
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