#include <reg52.h>
#define unint unsigned int
#define unchar unsigned char
delay(unchar n)
{unint i,AI;
for (i=n;i>0;i--)
for (AI=100;AI>0;AI--);
}
void main()
{
TMOD=0X20;
TH1=0xfd;
TL1=0xfd;
TR1=1;
REN=1;
SM0=0;
SM1=1;
EA=1;
ES=1;
while(1)
{
while(!TI);
TI=0;
SBUF=0x88;
while(!TI);
TI=0;
SBUF=0xaa;
delay(200);
}
}
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