Table 66A - Time, Calendar and Alarm 1 Bytes
ADD
REGISTER FUNCTION
Register 0: Seconds
BCD RANGE
00-59
BINARY RANGE
00-3B
0
1
2
3
4
Register 1: Seconds Alarm
Register 2: Minutes
Register 3: Minutes Alarm
Register 4: Hours
00-59
00-3B
00-59
00-3B
00-59
00-3B
01-12 am
81-92 pm
00-23
01-0C
81-8C
00-17
(12 hour mode)
(24 hour mode)
5
Register 5: Hours Alarm
(12 hour mode)
01-12 am
81-92 pm
00-23
01-0C
81-8C
00-17
(24 hour mode)
6
7
8
9
Register 6: Day of Week
Register 7: Day of Month
Register 8: Month
01-07
01-07
01-31
01-1F
01-12
01-0C
00-63
Register 9: Year
00-99
Table 66B - Century Byte and Alarm 2 Bytes
DECIMAL
RANGE
0-99
BCD
RANGE
00-99
ADDRESS
40h
REGISTER FUNCTION
Register 0: Century Byte
BINARY RANGE
00-63
41h
42h
Register 1: Seconds Alarm 2
Register 2: Minutes Alarm 2
0-59
0-59
00-59
00-59
00-3B
00-3B
12-hr
mode
24-hr
mode
1-12
01-12 AM
81-92 PM
00-23
01-0C AM
81-8C PM
00-17
43h
Register 3: Hours Alarm 2
0-23
44h
45h
46h
47h
Register 4: Day of Week Alarm 2
Register 5: Date of Month Alarm 2
Register 6: Month Alarm 2
1-7
01-07
01-31
01-12
00-99
01-07
01-1F
01-0C
00-63
1-31
1-12
0-99
Register 7: Year Alarm 2
Alarm 2 Function
Alarm 2 can only be used as a wake-up alarm to
turn on power to the system when the system is
powered off. There are two bits used to control
alarm 2. The Alarm 2 wake-up function is
enabled via the Alarm 2 Enable bit, AL2_EN, in
the Soft Power Enable Register 2. The alarm 2
Remember Enable bit, AL2_REM_EN, in the
RTC Control Register 1, is used to power-up the
150
SMSC [ SMSC CORPORATION ]
