Freescale Semiconductor MC68HC908MR32 - Manual (Page 93)

IRQ Pin
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
Freescale Semiconductor 93
Figure 8-3. IRQ Interrupt Flowchart
FROM RESET
I BIT SET?
FETCH NEXT
YES
NO
INTERRUPT?
INSTRUCTION
SWI
INSTRUCTION?
RTI
INSTRUCTION?
NO
STACK CPU REGISTERS
NO
SET I BIT
LOAD PC WITH INTERRUPT VECTOR
NO
YES
UNSTACK CPU REGISTERS
EXECUTE INSTRUCTION
YES
YES