#include <reg52.h>//引入52系列单片机头文件

//位定义，sbit 标识符 = 地址值
sbit led1=P2^0;
sbit led2=P2^1;
sbit led3=P2^2;
sbit led4=P2^3;
sbit led5=P2^4;
sbit led6=P2^5;
sbit led7=P2^6;
sbit led8=P2^7;

//延迟函数,单位约10微秒，此处利用的是CPU处理的延时，并不准确
//11.0952MHz测得执行时间为0.000009771593，约为9.771593微秒
void delay(int us)
{
 while(us--);//循环执行，递减
}

void main()
{
 while(1)
 {
  led1=0;//设置低电平点亮LED，断点开始时间0.00042318
  delay(10000);//1秒为1000毫秒1000000微秒，此处为0.1秒，断点结束时间0.09813911
  led1=1;//设置高电平熄灭LED
  delay(10000);
  
  led2=0;
  delay(10000);
  led2=1;
  delay(10000);
  
  led3=0;
  delay(10000);
  led3=1;
  delay(10000);
  
  led4=0;
  delay(10000);
  led4=1;
  delay(10000);
  
  led5=0;
  delay(10000);
  led5=1;
  delay(10000);
  
  led6=0;
  delay(10000);
  led6=1;
  delay(10000);
  
  led7=0;
  delay(10000);
  led7=1;
  delay(10000);
  
  led8=0;
  delay(10000);
  led8=1;
  delay(10000);
 }
}