ex3.c

proteus仿真的三个例子

#include <REG51.H>

sbit P1_0=P1^0;

sbit P3_0=P3^0;

void main(void)
{
    
	    P1=0xFF;
START:   
      
bb:    if (P3_0==1) goto bb;
cc:    if (P3_0==0) goto cc;
	  
       P1_0=!P1_0;
       goto START;
	
}