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#include <reg52.h>//????????
#include <intrins.h>//????λ?????
unsigned int i;
void delay(int ms)
{
int ii,jj;
for(ii=ms;ii>0;ii--)
for(jj=110;jj>0;jj--);
}
void main()
{
unsigned char temp=0x01;
while(1)
{
P0=~temp;
delay(500);
temp=temp<<1;
if(temp==0)
temp=01;
}
}
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