#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit LED1 = P1^0;
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--);
for(y=120;y>0;y--);
}
void main()
{
while(1)
{
P1 = 0x55;
delay(1000);
P1 = 0xff;
delay(1000);
}
}
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