#include <18f452.h>
#use delay (clock = 20000000)
#fuses HS, NOWDT, NOLVP
#include <452Registers.h>

#int_TIMER0
void tmr0_isr(){
     *PORTB ^= 0x01;
}

main(){
   *TRISB = 0x00;
   *T0CON = 0x95;
   *INTCON |= 0xE0;
   while(1);
}