DS1306N View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated
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Description
Manufacturer
DS1306N Datasheet PDF : 20 Pages
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DS1306
CLOCK, CALENDAR, AND ALARM
The time and calendar information is obtained by reading the appropriate register bytes. The real time
clock registers are illustrated in Figure 3. The time, calendar, and alarm are set or initialized by writing
the appropriate register bytes. Note that some bits are set to 0. These bits will always read 0 regardless
of how they are written. Also note that registers 12h to 1Fh (read) and registers 92h to 9Fh are reserved.
These registers will always read 0 regardless of how they are written. The contents of the time, calendar,
and alarm registers are in the Binary-Coded Decimal (BCD) format.
RTC REGISTERS Figure 3
RTC REGISTERS DS1306
HEX ADDRESS
READ WRITE
00H
80H
01H
81H
02H
82H
03H
83H
04H
84H
05H
85H
06H
86H
07H
87H
08H
88H
09H
89H
0AH
8AH
0BH
8BH
0CH
8CH
0DH
8DH
0EH
8EH
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0
10 SEC
SEC
0
10 MIN
MIN
0 12/2 10 10 HR
4 P/A
HOURS
0
0
0
0
0
DAY
0
0
10 DATE
DATE
0
0
10 MONTH
MONTH
10 YEAR
YEAR
Alarm 0
M
10 SEC ALARM
SEC ALARM
M
10 MIN ALARM
MIN ALARM
M 12/2 10 10 HR
4 P/A
HOUR ALARM
M00
0
0
DAY ALARM
Alarm 1
M
10 SEC ALARM
SEC ALARM
M
10 MIN ALARM
MIN ALARM
M 12/2 10 10 HR
4 P/A
HOUR ALARM
M00
0
0
DAY ALARM
RANGE
00-59
00-59
01-12 + P/A
00-23
01-07
1-31
01-12
00-99
00-59
00-59
01-12 + P/A
00-23
01-07
00-59
00-59
01-12 + P/A
00-23
01-07
0FH
10H
11H
12-1FH
8FH
90H
91H
92-9FH
CONTROL REGISTER
STATUS REGISTER
TRICKLE CHARGER REGISTER
RESERVED
NOTE:
Range for alarm registers does not include mask’m’ bits.
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