
Technical Data
MC68HC705KJ1MC68HRC705KJ1MC68HLC705KJ1 — Rev. 3.0
102
External Interrupt Module (IRQ)
MOTOROLA
External Interrupt Module (IRQ)
Figure 9-3. Interrupt Flowchart
EXTERNAL
INTERRUPT?
I BIT SET?
TIMER
INTERRUPT?
FETCH NEXT
INSTRUCTION.
SWI
INSTRUCTION?
RTI
INSTRUCTION?
STACK PCL, PCH, X, A, CCR.
SET I BIT.
LOAD PC WITH INTERRUPT VECTOR.
YES
UNSTACK CCR, A, X, PCH, PCL.
EXECUTE INSTRUCTION.
CLEAR IRQ LATCH.
NO
FROM RESET