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DS1306 Datasheet(PDF) 6 Page - Dallas Semiconductor

Part No. DS1306
Description  Serial Alarm Real-Time Clock
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1306 Datasheet(HTML) 6 Page - Dallas Semiconductor

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DS1306
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Figure 2. RTC REGISTERS AND ADDRESS MAP
HEX ADDRESS
READ
WRITE
Bit
7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
RANGE
00H
80H
0
10 SEC
SEC
00–59
01H
81H
0
10 MIN
MIN
00–59
P
12
A
01–12 + P/A
02H
82H
0
24
10
10-HR
HOURS
00–23
03H
83H
0
0
0
0
0
DAY
01–07
04H
84H
0
0
10-DATE
DATE
1–31
05H
85H
0
0
10-MONTH
MONTH
01–12
06H
86H
10-YEAR
YEAR
00–99
07H
87H
M
10-SEC ALARM 0
SEC ALARM 0
00–59
08H
88H
M
10-MIN ALARM 0
MIN ALARM 0
00–59
P
12
A
01–12 + P/A
09H
89H
M
24
10
10-HR
HOUR ALARM 0
00–23
0AH
8AH
M
0
0
0
0
DAY ALARM 0
01–07
0BH
8BH
M
10 SEC ALARM 1
SEC ALARM 1
00–59
0CH
8CH
M
10 MIN ALARM 1
MIN ALARM 1
00–59
P
12
A
01–12 + P/A
0DH
8DH
M
24
10
10-HR
HOUR ALARM 1
00–23
0EH
8EH
M
0
0
0
0
DAY ALARM 1
01–07
0FH
8FH
CONTROL REGISTER
10H
90H
STATUS REGISTER
11H
91H
TRICKLE CHARGER REGISTER
12–1FH
92–9FH
RESERVED
20–7FH
A0–
FFH
96-BYTES USER RAM
Note: Range for alarm registers does not include mask’m’ bits.
The DS1306 can be run in either 12-hour or 24-hour mode. Bit 6 of the hours register is defined as the
12- 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 second 10-hour bit (20 to 23
hours).
The DS1306 contains two time-of-day alarms. Time-of-day alarm 0 can be set by writing to registers 87h
to 8Ah. Time-of-day Alarm 1 can be set by writing to registers 8 Bh to 8 Eh. Bit 7 of each of the time-of-
day alarm registers are mask bits (Table 1). When all of the mask bits are logic 0, a time-of-day alarm
only occurs once per week when the values stored in timekeeping registers 00h to 03h match the values
stored in the time-of-day alarm registers. An alarm is generated every day when bit 7 of the day alarm
register is set to a logic 1. An alarm is generated every hour when bit 7 of the day and hour alarm
registers is set to a logic 1. Similarly, an alarm is generated every minute when bit 7 of the day, hour, and


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