Rainbow-electronics DS1337 Bedienungsanleitung PDF herunterladen (Seite 8)

DS1337 I

C Serial Real-Time Clock

8 of 15

ADDRESS MAP

Table 2 shows the address map for the DS1337 registers. During a multibyte access, when the address pointer

reaches the end of the register space (0Fh) it wraps around to location 00h. On an I

C START, STOP, or address

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 2. 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

Day

Alarm 1

Day

1–7

0AH A1M4

DY/DT

10 Date

Date

Alarm 1

Date

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

Day

Alarm 2

Day

1–7

0DH A2M4

DY/DT

10 Date

Date

Alarm 2

Date

1–31

0EH

EOSC

0 0 RS2 RS1 INTCN A2IE A1IE Control —

0FH OSF 0 0 0 0 0 A2F A1F Status —

Note: Unless otherwise specified, the state of the registers is not defined when power is first applied or V

falls below the V

OSC

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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