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#include<reg52.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char
uchar temp;
uint i;
uint aa;
void delay(uint n);
void main()
{
EA=1; //开总中断
EX0=1; //开外部中断0
temp=0xfe;
P1=temp;
while(1)
{
delay(50000);
temp=_crol_(temp,1);
P1=temp;
}
}
void delay(uint n)
{
uint a;
for(a=0;a<n;a++);
}
void int0_srv(void) interrupt 0 using 1
{
for(i=3;i>0;i--)
{
P1=0x00;
delay(5000);
P1=0xff;
delay(5000);
}
}
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