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main()
{
unsigned char dat;
TMOD=0x20;
TH1=0xfd;
TL1=0xfd;
TR1=1;
SCON=0x50;
while(1)
{
while(RI==0);
RI=0;
dat=SBUF;
SBUF=~dat;
while(TI==0)
TI=0;
}
}