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DS3232M

Table 2. Timekeeping Registers

Note: Unless otherwise specified, the registers’ state is not defined when power is first applied.

ADDRESS

BIT 7

MSB

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

LSB

FUNCTION

RANGE

00h

0

10 Seconds

Seconds

Seconds

00–59

01h

0

10 Minutes

Minutes

Minutes

00–59

02h

0

12/24

AM/PM

10

Hours

Hour

Hours

1–12 +

AM/PM

00–23

20

Hours

03h

0

0

0

0

0

Day

Day

1–7

04h

0

0

10 Date

Date

Date

01–31

05h

Century

0

0

10

Month

Month

Month/Century

01–12 +

Century

06h

10 Year

Year

Year

00–99

07h

A1M1

10 Seconds

Seconds

Alarm 1

Seconds

00–59

08h

A1M2

10 Minutes

Minutes

Alarm 1

Minutes

00–59

09h

A1M3

12/24

AM/PM

10

Hours

Hour

Alarm 1 Hours

1–12 +

AM/PM

00–23

20

Hours

0Ah

A1M4

DY/DT

10 Date

Day

Alarm 1 Day

1–7

Date

Alarm 1 Date

1–31

0Bh

A2M2

10 Minutes

Minutes

Alarm 2

Minutes

00–59

0Ch

A2M3

12/24

AM/PM

10

Hours

Hour

Alarm 2 Hours

1–12 +

AM/PM

00–23

20

Hours

0Dh

A2M4

DY/DT

10 Date

Day

Alarm 2 Day

1–7

Date

Alarm 2 Date

1–31

0Eh

EOSC

BBSQW

CONV

NA

NA

INTCN

A2IE

A1IE

Control

—

0Fh

OSF

BB32KHZ

0

0

EN32KHZ

BSY

A2F

A1F

Status

—

10h

SIGN

DATA

DATA

DATA

DATA

DATA

DATA

DATA

Aging Offset

—

11h

SIGN

DATA

DATA

DATA

DATA

DATA

DATA

DATA

Temperature

MSB

—

12h

DATA

DATA

0

0

0

0

0

0

Temperature

LSB

—

13h

SWRST

0

0

0

0

0

0

0

Test

—

14h–FFh

X

X

X

X

X

X

X

X

SRAM

00h–FFh