Motorola MC68VZ328 - Manual (Page 217)

Programming Model
Real-Time Clock 11-7
11.2.3 RTC Alarm Register
The real-time clock alarm (RTCALRM) register is used to configure the alarm. The hours, minutes, and
seconds can be read or written at any time. After a write, the current time assumes the new values. The
settings for the RTCTIME register are described in Table 11-4.
RTCALRM RTC Alarm Register 0x(ff)FFFB04
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 0 0 0 0 0 0 0 0 0 0 0 0 0
0x00000000
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SECONDS
TYPE rw rw rw rw rw rw
RESET
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0x00000000
Table 11-4. RTC Alarm Register Description
Name Description Setting
Reserved
Bits 31–29 Reserved These bits are reserved and should be set to
0.
HOURS
Bits 28–24 Hours—These bits indicate the value of the
hours field in the current alarm setting. This field can be set to any value between 0
and 23. Default is value 0.
Reserved
Bits 23–22 Reserved These bits are reserved and should be set to
0.
MINUTES
Bits 21–16 Minutes—These bits indicate the value of
the minutes field in the current alarm setting. This field can be set to any value between 0
and 59. Default is value 0.
Reserved
Bits 15–6 Reserved These bits are reserved and should be set to
0.
SECONDS
Bit 5–0 Seconds—These bits indicate the value of
the seconds field in the current alarm setting. This field can be set to any value between 0
and 59. Default is value 0.