System Interface Unit
MOTOROLA MPC823e REFERENCE MANUAL 12-21
SYSTEM INTERFACE UNIT
12
12.7.4 Real-Time Clock Alarm Register
The 32-bit read/write real-time clock alarm (RTCAL) register is an alarm reference register.
When the RTC register increments to the value stored in this register, an alarm interrupt is
generated.
ALARM—Alarm Reference Counter
This field indicates that an alarm interrupt will be generated as soon as there is a match
between this field and the corresponding bits in the RTC register. The alarm has a 1 second
resolution.
RTCAL
BIT 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
FIELD ALARM
RESET —
R/W R/W
ADDR (IMMR & 0xFFFF0000) + 0x22C
BIT 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
FIELD ALARM
RESET —
R/W R/W
ADDR (IMMR & 0xFFFF0000) + 0x22E
NOTE: — = Undefined.
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