MC68HC11G5 Datasheet, PDF (64/195 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcontroller

Freescale Semiconductor, Inc.
5-12
BEGIN
X BIT
IN CCR
YES
SET ?
NO
HIGHEST
PRIORITY
YES
INTERRUPT
?
NO
XIRQ PIN
LOW ?
NO
YES
SET X BIT IN CCR
FETCH VECTOR
$FFF4, FFF5
FETCH VECTOR
YES
IRQ ?
NO
FETCH VECTOR
$FFF2, FFF3
YES
RTII = 1 ?
NO
REAL-TIME
INTERRUPT
?
YES
FETCH VECTOR
$FFF0, FFF1
NO
YES
IC1I = 1 ?
NO
TIMER
IC1F ?
NO
YES
FETCH VECTOR
$FFEE, FFEF
YES
IC2I = 1 ?
NO
TIMER
IC2F ?
NO
YES
FETCH VECTOR
$FFEC, FFED
YES
IC3I = 1 ?
NO
TIMER
IC3F ?
NO
YES
FETCH VECTOR
$FFEA, FFEB
YES
OC1I = 1 ?
NO
TIMER
OC1F ?
NO
YES
FETCH VECTOR
$FFE8, FFE9
YES
OC2I = 1 ?
NO
TIMER
OC2F ?
NO
YES
FETCH VECTOR
$FFE6, FFE7
YES
OC3I = 1 ?
NO
TIMER
OC3F ?
NO
YES
FETCH VECTOR
$FFE4, FFE5
YES
OC4I = 1 ?
NO
2A
TIMER
OC4F ?
NO
YES
FETCH VECTOR
$FFE2, FFE3
2B
Figure 5-3. Interrupt Priority Resolution
RESETS, INTERRUPTS AND LOW POWER MODES
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