MC68HC705K1 Datasheet, PDF (49/140 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Interrupts
Interrupt Processing
Figure 4-4 shows the sequence of events caused by an interrupt.
FROM
RESET
YES
I BIT SET?
NO
EXTERNAL
YES
INTERRUPT?
NO
CLEAR IRQ LATCH
TIMER
YES
INTERRUPT?
NO
STACK PCL, PCH, X, A, CCR
SET I BIT
LOAD PC WITH INTERRUPT VECTOR
FETCH NEXT
INSTRUCTION
SWI
YES
INSTRUCTION?
NO
RTI
YES
INSTRUCTION?
NO
UNSTACK CCR, A, X, PCH, PCL
EXECUTE INSTRUCTION
Figure 4-4. Interrupt Flowchart
MC68HC705K1 — Rev. 2.0
Interrupts
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Technical Data