#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
void delay(uint a)
{
uchar i;
while(a--)for(i=0;i<120;i++);
}
main()
{
uint i;
while(1)
{
for(i=0;i<5;i++)
{
P0=0x00;
delay(1000);
P0=0xff;
dela(1000);
}
P0=0x00;
delay(2000);
}
}
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