MC68HC08AS32 Datasheet, PDF (178/394 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

External Interrupt (IRQ)
FROM RESET
YES
I BIT SET?
NO
INTERRUPT?
NO
YES
STACK CPU REGISTERS
SET I BIT
LOAD PC WITH INTERRUPT VECTOR
FETCH NEXT
INSTRUCTION.
SWI
YES
INSTRUCTION?
NO
RTI
YES
INSTRUCTION?
NO
UNSTACK CPU REGISTERS
EXECUTE INSTRUCTION
Figure 14-2. IRQ Interrupt Flowchart
Advance Information
178
External Interrupt (IRQ)
MC68HC08AS32 — Rev. 3.0
MOTOROLA