moder51汇编程序框架D4为串口发送中断指示灯；D5为外部中断1指示灯；D6为外部中断0指示灯；D7为串口接收中断指示灯；D8为定时器指示灯；-moder 51 D4 Series procedural framework for the serial interrupt this light　D5 for external interrupt a lamp　D6 for external interrupt 0 lamp　D7 for the serial receiver interrupt indicator　D8 for the timer lamp