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#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
void delay(uint i)
{
uint j;
for(;i>0;i--);
}
void main()
{
TMOD=0X50;
TH1=0XFF;
TL1=0XFC;
EA=1;
ET1=1;
TR1=1;
while(1);
}
void T1_int(void) interrupt 3
{
for(;;)
{
P1=0XFF;
delay(500);
P1=0;
delay(500);
}
}
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