Datasheet

DS12885/DS12887/DS12887A/DS12C887/DS12C887A

Real-Time Clocks

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Table 2B. Time, Calendar, and Alarm Data Modes—Binary Mode (DM = 1)

ADDRESS BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 FUNCTION RANGE

00H 0 0 Seconds Seconds 00–3B

01H 0 0 Seconds Seconds Alarm 00–3B

02H 0 0 Minutes Minutes 00–3B

03H 0 0 Minutes Minutes Alarm 00–3B

AM/PM 0 Hours

04H

Hours

01–0C +AM/PM

00–17

AM/PM 0 Hours

05H

Hours

Hours Alarm

01–0C +AM/PM

00–17

06H 0 0 0 0 0 Day Day 01–07

07H 0 0 0 Date Date 01–1F

08H 0 0 0 0 Month Month 01–0C

09H 0 Year Year 00–63

0AH UIP DV2 DV1 DV0 RS3 RS2 RS1 RS0 Control —

0BH SET PIE AIE UIE SQWE DM 24/12 DSE Control —

0CH IRQF PF AF UF 0 0 0 0 Control —

0DH VRT 0 0 0 0 0 0 0 Control —

0EH-31H X X X X X X X X RAM —

32H N/A N/A Century* —

33H-7FH X X X X X X X X RAM —

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.