Freescale Semiconductor, Inc.
External Interrupt Module (IRQ)
FROM RESET
YES
I BIT SET?
NO
YES
INTERRUPT?
NO
STACK CPU REGISTERS
SET I BIT
LOAD PC WITH INTERRUPT VECTOR
FETCH NEXT
INSTRUCTION
SWI
INSTRUCTION?
YES
YES
NO
RTI
UNSTACK CPU REGISTERS
EXECUTE INSTRUCTION
INSTRUCTION?
NO
Figure 16-3. IRQ Interrupt Flowchart
Technical Data
MC68HC908AS60 — Rev. 1.0
External Interrupt Module (IRQ)
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