MC68HC908LJ12 Datasheet, PDF (221/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Real Time Clock (RTC)
12.6.4 Alarm Minute and Hour Registers (ALMR and ALHR)
These read/write registers contain the alarm minute and hour values for
the hour and minute alarm function. When the hour counter matches the
value in the alarm hour register (ALHR) and the minute counter matches
the value in the alarm minute register (ALMR), the alarm flag, ALMF, is
set. When ALMF is set and the alarm interrupt enable bit, ALMIE, is also
set, a CPU interrupt request is generated.
Address: $0045
Read: 0
Write:
Reset: 0
0
AM5
AM4
AM3
AM2
AM1
AM0
0
0
0
0
0
0
0
= Unimplemented
Figure 12-6. Alarm Minute Register (ALMR)
NOTE: Writing values other than 0 to 59, to ALMR is possible, but the alarm flag
will never be set.
Address: $0046
Read: 0
0
0
AH4
AH3
AH2
AH1
AH0
Write:
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 12-7. Alarm Hour Register (ALHR)
NOTE: Writing values other than 0 to 23, to ALHR is possible, but the alarm flag
will never be set.
Technical Data
222
Real Time Clock (RTC)
MC68HC908LJ12 — Rev. 2.1
Freescale Semiconductor