LED

#include<reg51.h>

#define led P0

void delay(unsigned char);

void main()

{

P0=0xff;

while(1)

{

led=0x55;

delay(10);

led=0xAA;

delay(10);

}

}

void delay(unsigned char b)

{

unsigned char i,j;

for(i=0;i<5;i++)

for(j=0;j<b;j++);

}