#include<reg51.h>
sbit led=P2^2;
void main()
{
SCON=0X50;
TMOD=0X20;
PCON=0X80;
TH1=0XF3;
TL1=0XF3;
ES=1;
EA=1;
TR1=1;
P2=0x00;
while(1) {
}
}
void Usart() interrupt 4
{
unsigned char a;
a=SBUF;
RI = 0;
SBUF=a;
if(a==12){
led=1;
}
while(!TI);
TI=0;
}
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