MC68HC11KW1 Datasheet, PDF (109/238 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

Begin
X-bit in
Yes
CCR set?
No
Set X-bit in CCR.
XIRQ pin
Yes
Fetch vector at
low?
$FFF4, $FFF5
No
Highest priority
Yes
interrupt?
No
IRQ?
Yes
No
Fetch vector
5
Fetch vector at
$FFF2, $FFF3
RTII = 1?
Yes
No
RTIF = 1?
Yes
No
Fetch vector at
$FFF0, $FFF1
IC1I = 1?
Yes
No
IC1F = 1?
Yes
No
Fetch vector at
$FFEE, $FFEF
IC2I = 1?
Yes
No
IC2F = 1?
Yes
No
Fetch vector at
$FFEC, $FFED
IC3I = 1?
Yes
No
IC3F = 1?
Yes
No
Fetch vector at
$FFEA, $FFEB
OC1I = 1?
Yes
No
2A
OC1F = 1?
Yes
No
Fetch vector at
$FFE8, $FFE9
2B
Figure 5-3 Interrupt priority resolution (1 of 3)
MC68HC11KW1
RESETS AND INTERRUPTS
5-19