MC68HC908MR8 Datasheet, PDF (300/372 Pages) Motorola, Inc – Microcontrollers

External Interrupt (IRQ)
FROM RESET
YES
I BIT SET?
NO
INTERRUPT?
NO
YES
STACK CPU REGISTERS
SET I BIT
LOAD PC WITH INTERRUPT VECTOR
FETCH NEXT
INSTRUCTION
SWI
YES
INSTRUCTION?
NO
RTI
YES
INSTRUCTION?
NO
UNSTACK CPU REGISTERS
EXECUTE INSTRUCTION
Figure 16-3. IRQ Interrupt Flowchart
Technical Data
300
External Interrupt (IRQ)
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor