MC68HC11P2 Datasheet, PDF (207/268 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Resets and Interrupts
Low power operation
1B
I-bit in
Yes
CCR set?
No
I-bit interrupt
pending?
No
Yes
Stack
CPU registers
Stack CPU registers.
Set X and I bits.
Fetch vector at
No
$FFF8, $FFF9
Stack CPU registers.
Set X and I bits.
Fetch vector at
Yes
$FFF6, $FFF7
Restore
CPU registers
Yes
from Stack
Fetch
opcode
Legal
opcode?
Yes
WAI?
No
SWI?
Yes
Stack
CPU registers
Interrupt
yet?
No
No
RTI?
Yes
Set I-bit
No
Execute this
instruction
Resolve interrupt
priority and fetch
vector
for highest pending
source (Figure 10-3)
1A
Start next instruction
sequence
MC68HC11P2 — Rev 1.0
Resets and Interrupts
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Technical Data