MC68HC08AZ32A Datasheet, PDF (96/312 Pages) Motorola, Inc – HCMOS Microcontroller Unit

External Interrupt (IRQ) Module
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 7-4. IRQ Interrupt Flowchart
MC68HC08AZ32A Data Sheet, Rev. 2
96
Freescale Semiconductor