DS1343_1112 Datasheet, PDF (12/20 Pages) Maxim Integrated Products – Low-Current SPI/3-Wire RTCs

Low-Current SPI/3-Wire RTCs
Table 1. Register Map
ADDRESS
00h
01h
BIT 7
MSB
0
0
02h
0
03h
0
04h
0
05h
Century
06h
BIT 6
BIT 5 BIT 4
10 Seconds
10 Minutes
12/24
AM/PM
20
Hours
10
Hours
0
0
0
0
10 Date
0
0
10
Month
10 Year
07h
A0M1
10 Seconds
BIT 3
0
BIT 2 BIT 1
Seconds
Minutes
Hour
Day
Date
Month
Year
Seconds
08h
A0M2
10 Minutes
AM/PM
09h
A0M3
12/24
10
20
Hours
Hours
0Ah
A0M4
0
0
0
0Bh
A1M1
10 Seconds
Minutes
Hour
Day
Seconds
0Ch
A1M2
10 Minutes
Minutes
AM/PM
0Dh
A1M3
12/24
10
20
Hours
Hours
Hour
0Eh
A1M4
0
0
0
Day
0Fh
EOSC
X
DOSF EGFIL
SQW
INTCN A1IE
10h
OSF
0
0
0
0
0
IRQF1
11h
TCS3
TCS2
TCS1 TCS0
DS1
DS0
RS1
12h–1Fh
20h–7Fh
Reserved
User RAM
Note: Bits listed as 0 always read back as 0 and cannot be written to 1.
BIT 0
LSB
A0IE
IRQF0
RS0
FUNCTION RANGE
Seconds
Minutes
Hours
Day
Date
Month/
Century
Year
Alarm 0
Seconds
Alarm 0
Minutes
Alarm 0 Hours
Alarm 0 Day
Alarm 1
Seconds
Alarm 1
Minutes
Alarm 1 Hours
Alarm 1 Day
Control
Status
Trickle
Charger
Reserved
User RAM
00–59
00–59
1–12 +
AM/PM
00–23
1–7
01–31
01–12 +
Century
00–99
00–59
00–59
1–12 +
AM/PM
00–23
1–7
00–59
00–59
1–12 +
AM/PM
00–23
1–7
—
—
—
—
00h–FFh
Table 2. Alarm Mask Bits
ALARM REGISTER MASK BITS (BIT 7)
A_M4
A_M3
A_M2
A_M1
1
1
1
1
1
1
1
0
1
1
0
0
1
0
0
0
0
0
0
0
ALARM RATE
Alarm once a second
Alarm when seconds match
Alarm when minutes and seconds match
Alarm when hours, minutes, and seconds match
Alarm when day, hours, minutes, and seconds match
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