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/*本程序实现p0口输出单向流水灯*/

#include"reg51.h"
#include"intrins.h"
/*1ms延时子程序*/
void mDelay(unsigned int i)
{
    unsigned int j;
for(;i>0;i--)
     for(j=0;j<125;j++);
}
/*main主程序*/
void main()
{
    unsigned char ledctr=0xfe;

    while(1)
    {
P0=ledctr;
ledctr=_crol_(ledctr,1);           /*左移库函数*/
mDelay(100);
    }
}