MC68HC705J1ACPE Datasheet, PDF (103/162 Pages) Freescale Semiconductor, Inc – Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.
External Interrupt Module (IRQ)
Operation
FROM RESET
YES
I BIT SET?
NO
EXTERNAL
YES
INTERRUPT?
NO
CLEAR IRQ LATCH
TIMER
INTERRUPT?
NO
YES
STACK PCL, PCH, X, A, CCR
SET I BIT
LOAD PC WITH INTERRUPT VECTOR
FETCH NEXT
INSTRUCTION
SWI
YES
INSTRUCTION?
NO
RTI
YES
INSTRUCTION?
UNSTACK CCR, A, X, PCH, PCL
NO
EXECUTE INSTRUCTION
Figure 8-2. Interrupt Flowchart
MC68HC705J1A — Rev. 4.0
External Interrupt Module (IRQ)
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Technical Data