Datasheet

Functional Description
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
Freescale Semiconductor 173
Figure 17-3. 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