Freescale Semiconductor, Inc.
Resets and Interrupts
Begin
Set X-bit in CCR.
Fetch vector at
$FFF4, $FFF5
X-bit in
CCR set?
XIRQ pin
low?
Yes
Yes
Yes
No
No
Highest priority
interrupt?
Fetch vector
No
Fetch vector at
$FFF2, $FFF3
Yes
Yes
IRQ?
No
Fetch vector at
$FFF0, $FFF1
Yes
Yes
Yes
Yes
Yes
RTII = 1?
No
RTIF = 1?
No
Fetch vector at
$FFEE, $FFEF
Yes
Yes
Yes
Yes
IC1I = 1?
No
IC1F = 1?
No
Fetch vector at
$FFEC, $FFED
IC2I = 1?
No
IC2F = 1?
No
Fetch vector at
$FFEA, $FFEB
IC3I = 1?
No
IC3F = 1?
No
Fetch vector at
$FFE8, $FFE9
OC1I = 1?
No
OC1F = 1?
No
2A
2B
Technical Data
MC68HC11P2 — Rev 1.0
Resets and Interrupts
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