Interrupt processing, Figure 7-8. interrupt processing – Freescale Semiconductor MC68HC08KH12 User Manual
Page 73
MC68HC(7)08KH12
—
Rev. 1.1
Advance Information
Freescale Semiconductor
73
Figure 7-8. Interrupt Processing
NO
NO
NO
YES
NO
NO
YES
NO
YES
YES
FROM RESET
BREAK
I BIT SET?
IRQ1
INTERRUPT?
USB
INTERRUPT?
FETCH NEXT
INSTRUCTION
UNSTACK CPU REGISTERS.
STACK CPU REGISTERS
SET I BIT
LOAD PC WITH INTERRUPT VECTOR
EXECUTE INSTRUCTION.
YES
YES
I BIT SET?
INTERRUPT?
YES
OTHER
INTERRUPTS?
NO
SWI
INSTRUCITON?
RTI
INSTRUCITON?