MC68HC05K0 Datasheet, PDF (52/154 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Technical Data
Freescale Semiconductor, Inc.
Figure 4-4 shows the sequence of events caused by an interrupt.
FROM
RESET
YES
I BIT SET?
NO
EXTERNAL
YES
INTERRUPT?
NO
CLEAR IRQF BIT
TIMER
YES
INTERRUPT?
NO
STACK PC, 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, PC
EXECUTE INSTRUCTION
Figure 4-4. Interrupt Flowchart
Technical Data
MC68HC05K0 • MC68HC05K1 — Rev. 2.0
Interrupts
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