Freescale Semiconductor, Inc.
BEGIN
X BIT
IN CCR SET
?
XIRQ PIN
LOW
?
YES
YES
YES
YES
YES
YES
YES
YES
YES
SET X BIT IN CCR
FETCH VECTOR
$FFF4, FFF5
NO
NO
HIGHEST
PRIORITY
INTERRUPT
?
FETCH VECTOR
NO
FETCH VECTOR
$FFF2, FFF3
IRQ
?
NO
REAL-TIME
INTERRUPT
?
YES
YES
YES
YES
YES
FETCH VECTOR
$FFF0, FFF1
RTII = 1
?
NO
NO
TIMER
IC1F
?
FETCH VECTOR
$FFEE, FFEF
IC1I = 1
?
NO
NO
TIMER
IC2F
?
FETCH VECTOR
$FFEC, FFED
IC2I = 1
?
NO
NO
TIMER
IC3F
?
FETCH VECTOR
$FFEA, FFEB
IC3I = 1
?
NO
NO
TIMER
OC1F
?
FETCH VECTOR
$FFE8, FFE9
OC1I = 1
?
NO
2A
NO
2B
Figure 5-3 Interrupt Priority Resolution (1 of 2)
RESETS AND INTERRUPTS
MC68HC11F1
TECHNICAL DATA
5-14
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