23-4
MC9328MX1 Reference Manual
MOTOROLA
Real-Time Clock (RTC)
23.2 Programming Model
The RTC module includes ten 32-bit registers. Table 23-2 summarizes these registers and their addresses.
23.2.1 RTC Days Counter Register
The real-time clock days counter register (DAYR) is used to program the day for the TOD clock. When the
HOUR field of the HOURMIN register rolls over from 23 to 00, the day counter increments. It can be read
or written at any time. After a write, the time changes to the new value. This register cannot be reset
because the real-time clock is always enabled at reset.
NOTE:
This day counter only supports halfword and word write operations. That
means that all 9 bits must be set simultaneously.
Table 23-2. RTC Module Register Memory Map
Description
Name
Address
RTC Days Counter Register
DAYR
0x00204020
RTC Hours and Minutes Counter Register
HOURMIN
0x00204000
RTC Seconds Counter Register
SECONDS
0x00204004
RTC Day Alarm Register
DAYALARM
0x00204024
RTC Hours and Minutes Alarm Register
ALRM_HM
0x00204008
RTC Seconds Alarm Register
ALRM_SEC
0x0020400C
RTC Control Register
RCCTL
0x00204010
RTC Interrupt Status Register
RTCISR
0x00204014
RTC Interrupt Enable Register
RTCIENR
0x00204018
Stopwatch Minutes Register
STPWCH
0x0020401C
DAYR
RTC Days Counter Register
Addr
0x00204020
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
DAYS
TYPE
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
?
?
?
?
?
?
?
?
?
0x0???
Содержание DragonBall MC9328MX1
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