DS1339 Datasheet, PDF (10/18 Pages) Dallas Semiconductor – Serial Real-Time Clock

DS1339 I²C Serial Real-Time Clock
ADDRESS MAP
Figure 6 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.
Figure 6. 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
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
10H
0
10 Minutes
Minutes
Minutes
00–59
AM/PM
0
12/24
10 Hour
10 Hour
0
0
0
0
Century
0
0
0
0
10 Date
0
10
Month
10 Year
A1M1
10 Seconds
A1M2
A1M3
12/24
10 Minutes
AM/PM
10 Hour
10 Hour
Hour
Day
Date
Month
Year
Seconds
Minutes
Hour
A1M4 DY/DT
10 Date
Day, Date
A2M2
A2M3
12/24
10 Minutes
AM/PM
10 Hour
10 Hour
Minutes
Hour
A2M4 DY/DT
10 Date
Day, Date
EOSC
0
0
RS2
RS1 INTCN A2IE
A1IE
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
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
OSF
TCS3
0
TCS2
0
TCS1
0
TCS0
0
DS1
0
A2F
A1F
Status
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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