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


main(){
   set_tris_e(0x03);   // E0 and E1 inputs....
   set_tris_b(0x00);   // Port B all oputputs...
   while(1){
        if( input(PIN_E0) == 1){
           output_toggle(PIN_B0);}
   }
}