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DS3232M
±5ppm, I2C Real-Time Clock with SRAM
13
Maxim Integrated
Table 2. Timekeeping Registers
Note: Unless otherwise specified, the registers’ state is not defined when power is first applied.
ADDRESS
BIT 7
MSB
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
LSB
FUNCTION
RANGE
00h
0
10 Seconds
Seconds
00–59
01h
0
10 Minutes
Minutes
00–59
02h
0
12/24
AM/PM
10
Hours
Hour
Hours
1–12 +
AM/PM
00–23
20
Hours
03h
0
Day
1–7
04h
0
10 Date
Date
01–31
05h
Century
0
10
Month
Month/Century
01–12 +
Century
06h
10 Year
Year
00–99
07h
A1M1
10 Seconds
Seconds
Alarm 1
Seconds
00–59
08h
A1M2
10 Minutes
Minutes
Alarm 1
Minutes
00–59
09h
A1M3
12/24
AM/PM
10
Hours
Hour
Alarm 1 Hours
1–12 +
AM/PM
00–23
20
Hours
0Ah
A1M4
DY/DT
10 Date
Day
Alarm 1 Day
1–7
Date
Alarm 1 Date
1–31
0Bh
A2M2
10 Minutes
Minutes
Alarm 2
Minutes
00–59
0Ch
A2M3
12/24
AM/PM
10
Hours
Hour
Alarm 2 Hours
1–12 +
AM/PM
00–23
20
Hours
0Dh
A2M4
DY/DT
10 Date
Day
Alarm 2 Day
1–7
Date
Alarm 2 Date
1–31
0Eh
EOSC
BBSQW
CONV
NA
INTCN
A2IE
A1IE
Control
—
0Fh
OSF
BB32KHZ
0
EN32KHZ
BSY
A2F
A1F
Status
—
10h
SIGN
DATA
Aging Offset
—
11h
SIGN
DATA
Temperature
MSB
—
12h
DATA
0
Temperature
LSB
—
13h
SWRST
0
Test
—
14h–FFh
X
SRAM
00h–FFh
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