#include <P18F458.h>	
void main(void)
  { 
    unsigned short long z;
    unsigned int x;
    TRISB = 0;			
    for(z=0;z<=100000;z++)
      {
        PORTB = 0x55;
        PORTB = 0xAA;
      }  
    while(1);			
  }