#include<reg52.h>
#include<intrins.h>
#define uint unsigned int
void delay(uint s)
{uint i,j;
for(i=s;i>0;i--)
for(j=110;j>0;j--);
}
sbit LED0=P1^0;
void main()
{int a=0xfe;
while(1)
{ LED0=0;
delay(1000);
LED0=1;
delay(500);
P2=a;
delay(500);
a=_crol_(a,1);
}
}
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