MC68HC11PH8 Datasheet, PDF (205/264 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

Begin
X-bit in
Yes
CCR set?
No
Highest priority
Yes
interrupt?
No
IRQ?
Yes
No
RTII = 1?
Yes
No
IC1I = 1?
Yes
No
IC2I = 1?
Yes
No
IC3I = 1?
Yes
No
OC1I = 1?
Yes
No
2A
Set X-bit in CCR.
XIRQ pin
Yes
Fetch vector at
low?
$FFF4, $FFF5
No
Fetch vector
RTIF = 1?
Yes
No
IC1F = 1?
Yes
No
IC2F = 1?
Yes
No
IC3F = 1?
Yes
No
OC1F = 1?
Yes
No
Fetch vector at
$FFF2, $FFF3
Fetch vector at
$FFF0, $FFF1
Fetch vector at
$FFEE, $FFEF
Fetch vector at
$FFEC, $FFED
Fetch vector at
$FFEA, $FFEB
Fetch vector at
$FFE8, $FFE9
2B
Figure 10-3 Interrupt priority resolution (1 of 3)
10
MC68HC11PH8
RESETS AND INTERRUPTS
TPG
MOTOROLA
10-21