21-0036 Просмотр технического описания (PDF) - Maxim Integrated
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21-0036 Datasheet PDF : 20 Pages
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DS1339 I2C Serial Real-Time Clock
ADDRESS MAP
Table 3 shows the address map for the DS1339 registers. During a multibyte access, when the address pointer
reaches the end of the register space (10h), it wraps around to location 00h. On an I2C START, STOP, or address
pointer incrementing to location 00h, 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 in case of an update of the main registers during a read.
Table 3. Timekeeper Registers
ADDRESS
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0 FUNCTION
RANGE
00h
0
10 Seconds
Seconds
Seconds
00–59
01h
0
10 Minutes
Minutes
Minutes
00–59
AM/PM
02h
0
12/24
10 Hour
20 Hour
03h
0
0
04h
0
0
05h
Century
0
0
0
0
10 Date
0
10
Month
Hour
Day
Date
Month
Hours
Day
Date
Month/
Century
1–12
+AM/PM
00–23
1–7
01–31
01–12 +
Century
06h
10 Year
Year
Year
00–99
07h
A1M1
10 Seconds
08h
A1M2
10 Minutes
AM/PM
09h
A1M3 12/24
10 Hour
20 Hour
0Ah
A1M4 DY/DT
10 Date
0Bh
A2M2
10 Minutes
AM/PM
0Ch
A2M3 12/24
10 Hour
20 Hour
0Dh
A2M4 DY/DT
10 Date
Seconds
Minutes
Hour
Day, Date
Minutes
Hour
Day, Date
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
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
0Eh
EOSC
0
BBSQI RS2
RS1 INTCN A2IE A1IE Control
—
0Fh
OSF
0
0
0
0
0
A2F
A1F
Status
—
10h
TCS3
TCS2 TCS1
TCS0
DS1
DS0
ROUT1 ROUT0
Trickle
Charger
—
Note: Unless otherwise specified, the state of the registers are not defined when power is first applied or when VCC and VBACKUP falls below the
VBACKUP(MIN).
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