#include <18F452.h>
#use delay (clock = 20000000)
#fuses HS, NOWDT, NOLVP
#define myDelay 500

int *TRISB = 0xF93, *PORTB = 0xF81;    // Data Sheet... Page 47.
main(){
    *TRISB = 0x00;
    *PORTB = 0x01;    // Make all my lights OFF.
     while(1){
       while(*PORTB < 0x08){
          *PORTB = *PORTB << 1;
          delay_ms(myDelay);}
       while(*PORTB > 0x01){
          *PORTB = *PORTB >> 1;
          delay_ms(myDelay);}
       }
}