用外部中断控制P1口外接8只灯闪烁。要求：P1口外接8只灯作左移循环点亮，当外中断发生时，作交叉闪烁4次后再左右闪动4次后回到循环左移点亮状态-P1 port interrupt control with external add-eight light flashes. Requirements: P1 port for external 8 lamps light up the left loop, when the external interrupt occurs, for cross