#include "C:\RS\Prog\off\off.h"

#int_EXT
void  EXT_isr(void) 
{
   printf("A");
}

void main()
{

   port_b_pullups(TRUE);
   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   setup_spi(SPI_SS_DISABLED);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);
   
   enable_interrupts(INT_EXT);
   enable_interrupts(GLOBAL);
   
   while(!input(PIN_B0))
      {
         output_high(PIN_A0);
         delay_ms(500);
         output_low(PIN_A0);
         delay_ms(500);
      }

}