MC68HC05P9A Datasheet, PDF (58/158 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Resets and Interrupts
FROM RESET
YES
I BIT SET?
NO
EXTERNAL
YES
INTERRUPT?
NO
CLEAR IRQ LATCH.
TIMER
INTERRUPT?
NO
YES
STACK PC, 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, PC.
NO
EXECUTE INSTRUCTION.
Figure 23. Interrupt Flowchart
14-mc68hc05p9a
58
Resets and Interrupts
MOTOROLA
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