RTC_SS
20.3.5.10 ALARM_HOURS_REG Register (offset = 28h) [reset = 0h]
ALARM_HOURS_REG is shown in
and described in
.
The ALARM_HOURS_REG is used to program the hour value for the alarm interrupt. Hours are stored as
BCD format. In BCD format, the decimal numbers 0 through 9 are encoded with their binary equivalent.
Figure 20-70. ALARM_HOURS_REG Register
31
30
29
28
27
26
25
24
Reserved
R-0h
23
22
21
20
19
18
17
16
Reserved
R-0h
15
14
13
12
11
10
9
8
Reserved
R-0h
7
6
5
4
3
2
1
0
ALARM_PM_nAM
Reserved
ALARM_HOUR1
ALARM_HOUR0
R/W-0h
R-0h
R/W-0h
R/W-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 20-73. ALARM_HOURS_REG Register Field Descriptions
Bit
Field
Type
Reset
Description
31-8
Reserved
R
0h
7
ALARM_PM_nAM
R/W
0h
Only used in PM_AM mode (otherwise 0)
0x0 = AM
0x1 = PM
6
Reserved
R
0h
5-4
ALARM_HOUR1
R/W
0h
2nd digit of hours, Range is 0 to 2
3-0
ALARM_HOUR0
R/W
0h
1st digit of hours, Range is 0 to 9
3643
SPRUH73H – October 2011 – Revised April 2013
Timers
Copyright © 2011–2013, Texas Instruments Incorporated