Rainbow-electronics DS1393 Manuel d'utilisateur télécharger pdf (Page 13)

Address Map

Table 2 shows the address map for the DS1390–

DS1393 RTC and RAM registers. The RTC registers are

located in address locations 00h to 0Fh in read mode,

and 80h to 8Fh in write mode. During a multibyte

access, when the address pointer reaches 0Fh, it

wraps around to location 00h. On the falling edge of the

CS pin (DS1390/DS1391) or the rising edge of CE

(DS1392/DS1393), 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 if the main registers update during a read. To

avoid rollover issues when writing to the time and date

registers, all registers should be written before the hun-

dredths-of-seconds registers reaches 99 (BCD).

DS1390/DS1391/DS1392/DS1393

Low-Voltage SPI/3-Wire RTCs with

Trickle Charger

____________________________________________________________________ 13

WRITE

ADDRESS

READ

ADDRESS

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

FUNCTION

RANGE

80h 00h Tenths of Seconds Hundredths of Seconds

Hundredths

of Seconds

0–99 BCD

81h 01h 0 10 Seconds Seconds Seconds

00–59 BCD

82h 02h 0 10 Minutes Minutes Minutes

00–59 BCD

AM/PM

83h 03h 0

12/24

10 Hour

Hour

Hour Hours

1–12 +AM/PM

00–23 BCD

84h 04h 0 0 0 0 0 Day Day 1–7 BCD

85h 05h 0 0 10 Date Date Date

01–31 BCD

86h 06h

Century

Month

Month/

Century

01–12 +

Century BCD

87h 07h 10 Year Year Year

00–99 BCD

88h 08h Tenths of Seconds Hundredths of Seconds

Alarm

Hundredths

of Seconds

0–99 BCD

89h 09h

AM1

10 Seconds Seconds

Alarm

00–59 BCD

8Ah 0Ah

AM2

10 Minutes Minutes

Alarm

00–59 BCD

AM/PM

8Bh 0Bh

AM3 12/24

10 Hour

Hour

Alarm Hours

1–12 +

AM/PM

00–23 BCD

Day Alarm Day 1–7 BCD

8Ch 0Ch

AM4 DY/DT

10 Date

Date

Alarm Date

1–31 BCD

BBSQI RS2 RS1 INTCN

0 AIE

DS1390/93

0XXX X0X DS1391

8Dh 0Dh

EOSC

BBSQI RS2 RS1 ESQW

0 AIE

Control

DS1392

8Eh 0Eh

OSF

0000 00AF Status —

8Fh 0Fh

TCS3 TCS2 TCS1 TCS0 DS1 DS0 ROUT1 ROUT0

Trickle

Charger

—

Table 2. Address Map

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

and V

BACKUP

) is first applied.

X = General-purpose read/write bit.

0 = Always reads as zero.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 23 24

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Rainbow-electronics DS1393 Manuel d'utilisateur Page 13

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