DS1393 Maxim Integrated Products, DS1393 Datasheet - Page 13

• Manufacturer Part Number: DS1393
• Description: (DS1390 - DS1393) Low-Voltage SPI/3-Wire RTCs
• Manufacturer: Maxim Integrated Products

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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
Table 2. Address Map
Note: Unless otherwise specified, the state of the registers is not defined when power (V
X = General-purpose read/write bit.
0 = Always reads as zero.
ADDRESS
WRITE
8Ch
8Dh
8Ah
8Bh
8Eh
80h
81h
82h
83h
84h
85h
86h
87h
88h
89h
8Fh
ADDRESS
READ
0Ah
0Bh
0Ch
0Dh
0Eh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Fh
Century
EOSC
BIT 7
TCS3
AM1
AM2
AM3
AM4
OSF
0
0
0
0
0
Tenths of Seconds
Tenths of Seconds
DY/DT
BIT 6
12/24
12/24
TCS2
Low-Voltage SPI/3-Wire RTCs with
0
0
0
0
0
0
0
Address Map
10 Year
10 Seconds
10 Seconds
____________________________________________________________________
10 Minutes
10 Minutes
10 Hour
10 Hour
AM/PM
AM/PM
BBSQI
BBSQI
BIT 5
TCS1
X
0
0
0
10 Date
10 Date
Month
BIT 4
TCS0
Hour
Hour
RS2
RS2
10
10
10
0
X
0
BIT 3
RS1
RS1
DS1
X
0
0
(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).
Hundredths of Seconds
Hundredths of Seconds
INTCN
ESQW
BIT 2
DS0
X
0
Seconds
Seconds
Minutes
Minutes
Month
Hour
Date
Year
Hour
Date
Day
ROUT1 ROUT0
BIT 1
Day
0
0
0
0
CC
Trickle Charger
and V
BIT 0
AIE
AIE
AF
X
BACKUP
Alarm Hours
FUNCTION
Hundredths
Hundredths
of Seconds
of Seconds
Alarm Date
Alarm Day
Seconds
Charger
) is first applied.
Minutes
Century
Control
Month/
Trickle
Hours
Status
Alarm
Alarm
Alarm
Date
Year
Day
1–12 +AM/PM
Century BCD
00–59 BCD
00–59 BCD
00–23 BCD
01–31 BCD
00–99 BCD
00–59 BCD
00–59 BCD
00–23 BCD
DS1390/93
0–99 BCD
0–99 BCD
1–31 BCD
1–7 BCD
1–7 BCD
RANGE
01–12 +
DS1391
DS1392
AM/PM
1–12 +
—
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