DS12887 Maxim, DS12887 Datasheet - Page 14

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DS12887

Manufacturer Part Number
DS12887
Description
The DS12885, DS12887, and DS12C887 real-time clocks (RTCs) are designed to be direct replacements for the DS1285 and DS1287
Manufacturer
Maxim
Datasheet

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Real-Time Clocks
Table 2B. Time, Calendar, and Alarm Data Modes—Binary Mode (DM = 1)
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
ADDRESS
0EH-31H
33H-7FH
0AH
0BH
0CH
0DH
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
32H
____________________________________________________________________
AM/PM
AM/PM
BIT 7
IRQF
SET
VRT
UIP
X
X
0
0
0
0
0
0
0
0
0
0
BIT 6
DV2
PIE
PF
X
X
0
0
0
0
0
0
0
0
0
0
N/A
BIT 5
DV1
AIE
AF
X
0
X
0
0
0
0
0
BIT 4
DV0
UIE
UF
0
X
0
0
0
0
X
Year
SQWE
BIT 3
RS3
Seconds
Seconds
Minutes
Minutes
X
X
0
0
0
Hours
Hours
Date
BIT 2
RS2
DM
0
0
X
X
Month
Hours
Hours
N/A
24/12
BIT 1
RS1
X
0
0
X
Day
BIT 0
DSE
RS0
X
0
0
X
Seconds Alarm
Minutes Alarm
Hours Alarm
FUNCTION
Seconds
Century*
Minutes
Control
Control
Control
Control
Month
Hours
Date
Year
RAM
RAM
Day
01–0C +AM/PM
01–0C +AM/PM
RANGE
00–3B
00–3B
00–3B
00–3B
01–0C
00–17
00–17
01–07
01–1F
00–63

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