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#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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Èç¹ûÒÑ·¢ËÍÍ꣨SBUF=0xaa;delay(200);£© while(!TI);Ôò³ÉËÀÑ­»·£¨TIÒÑΪ0£©£¬
ÔÚ9600ÏÂÒ»¸ö×Ö·ûÊÇ1ms£¬ËùÒÔdelay²»ÄÜ´óÓÚ1ms·ñÔòµ½whileʱTIÒÑΪ0.

ÒýÓÃ
Ó¦¸ÃÕâÑù:
while(1)
{
SBUF=0x88;
while(!TI);
TI=0;
SBUF=0xaa;
while(!TI);
TI=0;

delay(200);
}
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