可以将被测对象接入到外部中断来做。#includeunsignedintcnt;unsignedlongintt;sbitl_p=P3^2;bitflag=0;voidext0()interrupt0{TR0=1;while(l_p==0);TR0=0;flag=1;}voidt0isr()interrupt1{TH0=(65536-50000)/256;TL