DS3231M 데이터 시트보기 (PDF) - Maxim Integrated
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DS3231M Datasheet PDF : 20 Pages
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Table 2. Timekeeping Registers
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
A1M1
10 Seconds
BIT 3
0
BIT 2 BIT 1
Seconds
Minutes
BIT 0
LSB
Hour
Day
Date
Month
Year
Seconds
08h
A1M2
10 Minutes
Minutes
AM/PM
09h
A1M3
12/24
10
20
Hours
Hours
0Ah
A1M4 DY/DT
10 Date
Hour
Day
Date
0Bh
A2M2
10 Minutes
Minutes
AM/PM
0Ch
A2M3
12/24
10
20
Hours
Hours
Hour
0Dh
A2M4 DY/DT
10 Date
0Eh
EOSC BBSQW CONV
NA
Day
Date
NA
INTCN A2IE A1IE
0Fh
OSF
0
0
0
EN32KHZ BSY
A2F
A1F
10h
SIGN
DATA DATA DATA
DATA
DATA DATA DATA
11h
SIGN
DATA DATA DATA
DATA
DATA DATA DATA
12h
DATA DATA
0
0
0
0
0
0
Note: Unless otherwise specified, the registers’ state is not defined when power is first applied.
FUNCTION RANGE
Seconds
Minutes
Hours
Day
Date
Month/Century
Year
Alarm 1
Seconds
Alarm 1
Minutes
Alarm 1 Hours
Alarm 1 Day
Alarm 1 Date
Alarm 2
Minutes
Alarm 2 Hours
Alarm 2 Day
Alarm 2 Date
Control
Status
Aging Offset
Temperature
MSB
Temperature
LSB
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
1–31
00–59
1–12 +
AM/PM
00–23
1–7
1–31
—
—
81h–7Fh
—
—
Clock and Calendar
The time and calendar information is obtained by read-
ing the appropriate register bytes. Table 2 shows the
RTC registers. The time and calendar data are set or
initialized by writing the appropriate register bytes. The
contents of the time and calendar registers are in the
binary-coded decimal (BCD) format. The device can
be run in either 12-hour or 24-hour mode. Bit 6 of the
Hours register is defined as the 12-hour or 24-hour mode
select bit. When high, the 12-hour mode is selected. In
the 12-hour mode, bit 5 is the AM/PM bit with logic-high
being PM. In the 24-hour mode, bit 5 is the 20-hour bit
(20–23 hours). The century bit (bit 7 of the Month regis-
ter) is toggled when the Years register overflows from 99
11
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