#include"reg51.h"#include "intrins.h" /*调用能实现循环移位的头文件*/#define uint unsigned int#define uchar unsigned charchar temp;void delay(uint z) /*晶振频率为12MHZ,延时约1秒的子函数 */{ uint i,j; for(i=z;i>0;i--) for(j=120;j>0;j--);}void main(){ temp = 0xfe; while(1) { P1 = temp; temp = crol(temp,1); /*使变量temp循环左移的语句*/ ; /*调用延时子函数，延时1秒*/ }}