MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 221

• Manufacturer Part Number: MC68HC908LJ12CPB
• Description: 8-bit microcontroller units
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Real Time Clock (RTC)
12.6.4 Alarm Minute and Hour Registers (ALMR and ALHR)
Technical Data
222
NOTE:
NOTE:
Address:
Address:
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.
Writing values other than 0 to 59, to ALMR is possible, but the alarm flag
will never be set.
Writing values other than 0 to 23, to ALHR is possible, but the alarm flag
will never be set.
Reset:
Reset:
Read:
Write:
Read:
Write:
$0045
$0046
0
0
0
0
Figure 12-6. Alarm Minute Register (ALMR)
Figure 12-7. Alarm Hour Register (ALHR)
Real Time Clock (RTC)
= Unimplemented
= Unimplemented
0
0
0
0
AM5
0
0
0
AM4
AH4
0
0
AM3
AH3
0
0
MC68HC908LJ12
AM2
AH2
Freescale Semiconductor
0
0
AM1
AH1
0
0
—
Rev. 2.1
AM0
AH0
0
0