Motorola MC68VZ328 用户手册
Programming Model
Real-Time Clock
11-5
11.2
Programming Model
Section 11.2.1, “RTC Time Register,” through Section 11.2.9, “Stopwatch Minutes Register,” provide
programming information on the real-time clock.
programming information on the real-time clock.
11.2.1
RTC Time Register
The real-time clock hours, minutes, and seconds (RTCTIME) register is used to program the hours,
minutes, and seconds. It can be read or written at any time. After a write, the current time assumes the new
values. This register cannot be reset since the real-time clock is always enabled at reset. The settings for the
RTCTIME register are described in Table 11-2.
minutes, and seconds. It can be read or written at any time. After a write, the current time assumes the new
values. This register cannot be reset since the real-time clock is always enabled at reset. The settings for the
RTCTIME register are described in Table 11-2.
RTCTIME
RTC Hours, Minutes, and Seconds Register
0x(FF)FFFB00
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
BIT
16
HOURS
MINUTES
TYPE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
X
X
X
X
X
0
0
X
X
X
X
X
X
0xXXXX
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
BIT
0
SECONDS
TYPE
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
X
X
X
X
X
X
0x00XX
Table 11-2. RTC Hours, Minutes, and Seconds Register Description
Name
Description
Setting
Reserved
Bits 31–29
Bits 31–29
Reserved
These bits are reserved and should be set to 0.
HOURS
Bits 28–24
Bits 28–24
Hours—These bits indicate the current hour.
The bits can be set to any value between 0 and
23.
23.
Reserved
Bits 23–22
Bits 23–22
Reserved
These bits are reserved and should be set to 0.
MINUTES
Bits 21–16
Bits 21–16
Minutes—These bits indicate the current
minute.
minute.
The bits can be set to any value between 0 and
59.
59.
Reserved
Bits 15–6
Bits 15–6
Reserved
These bits are reserved and should be set to 0.
SECONDS
Bit 5–0
Bit 5–0
Seconds—These bits indicate the current sec-
ond.
ond.
The bits can be set to any value between 0 and
59.
59.