DS1339 Maxim, DS1339 Datasheet - Page 11

• Manufacturer Part Number: DS1339
• Description: The DS1339 serial real-time clock (RTC) is a low-power clock/date device with two programmable time-of-day alarms and a programmable square-wave output
• Manufacturer: Maxim

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