MC68HC908AZ60 Datasheet, PDF (196/480 Pages) Motorola, Inc – HCMOS Microcontroller Unit

External Interrupt Module (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 2. IRQ Interrupt Flowchart
MC68HC908AZ60 — Rev 2.0
194
External Interrupt Module (IRQ)
4-irq
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