DS1339 I

ADDRESS MAP

Table 3 shows the address map for the DS1339 registers. During a multibyte access, when the address pointer

reaches the end of the register space (10h), it wraps around to location 00h. On an I

pointer incrementing to location 00h, the current time is transferred to a second set of registers. The time

information is read from these secondary registers, while the clock may continue to run. This eliminates the need

to re-read the registers in case of an update of the main registers during a read.

Table 3. Timekeeper Registers

ADDRESS

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

FUNCTION

RANGE

00H

0

10 Seconds

Seconds

Seconds

00–59

01H

0

10 Minutes

Minutes

Minutes

00–59

AM/PM

02H

0

12/

24

10 Hour

10 Hour

Hour

Hours

1–12

+AM/PM

00–23

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

AM/PM

09H

A1M3

12/

24

10 Hour

10 Hour

Hour

Alarm 1

Hours

1–12 +

AM/PM

00–23

0AH

A1M4

DY/DT

10 Date

Day, Date

Alarm 1

Day,

Alarm 1

Date

1-7, 1-31

0BH

A2M2

10 Minutes

Minutes

Alarm 2

Minutes

00–59

AM/PM

0CH

A2M3

12/

24

10 Hour

10 Hour

Hour

Alarm 2

Hours

1–12 +

AM/PM

00–23

0DH

A2M4

DY/

DT

10 Date

Day, Date

Alarm 2

Day,

Alarm 2

Date

1–7, 1–31

0EH

EOSC

0

BBSQI

RS2

RS1

INTCN

A2IE

A1IE

Control

0FH

OSF

0

0

0

0

0

A2F

A1F

Status

10H

TCS3

TCS2

TCS1

TCS0

DS1

DS0

ROUT1

ROUT0

Trickle

Charger

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