// 4MHz
//#define INTS_PER_SECOND 4         // (4000000/(4*4*65536)) = 3,814697265625
//#define TICS_PER_MSECOND 3815       
// 8MHz
#define TICS_PER_MSECOND 7629       
#define INTS_PER_SECOND 8          // (8000000/4/65536/4)) = 7,62939453125

int8 seconds=0;      // A running seconds counter

#INT_TIMER1                        // This function is called every time
void clock_isr() {                 // timer 1 overflows (65535->0), which is
                                   // approximately 19 times per second for
    if(--int_count==0) {           // this program.
      if(seconds == 255) seconds = 0;
      ++seconds;
     
      int_count = INTS_PER_SECOND;
    }
}

// MAIN Procedure
void main()
{
   set_tris_a(0x3D);
   
   // Setup timer1 for seconds counting
   setup_timer_1(T1_INTERNAL | T1_DIV_BY_4);
   delay_ms(250);
   enable_interrupts(INT_TIMER1);
   delay_ms(250);
   enable_interrupts(GLOBAL);
   delay_ms(250);
   seconds = 0;
   
   
// Setup timer2 for our PWM generator
   setup_timer_2(T2_DIV_BY_16,127,1);      //499 us overflow, 499 us interrupt
   delay_ms(250);
// Setup PWM
   setup_ccp1(CCP_PWM);
   delay_ms(10);
   set_pwm1_duty(LIGHT_OFF8);
   delay_ms(150);


   // ADC (ÀÖÏ)
   setup_adc_ports(sAN0);
//   setup_adc_ports(sAN0 | sAN1);
//   setup_adc_ports(ALL_ANALOG /*sAN0 | sAN1 | sAN3*/);
   delay_ms(10);
//   setup_adc(ADC_CLOCK_INTERNAL|VSS_VDD);
   setup_adc(ADC_CLOCK_INTERNAL);
   delay_ms(10);
   set_adc_channel(0);
   delay_ms(10);
   setup_vref(VREF_LOW);
   delay_ms(10);
 //  setup_adc_ports(sAN1);
   setup_comparator( NC_NC_NC_NC );
   delay_ms(10);
 
   
  curtime = oldtime = seconds;
 
   
   while(TRUE)
   {
         Здесь, например,
         Если(seconds = 1) { делпем бип, или блым; seconds = 0; }
   }

}

void clock_isr() {                 // timer 1 overflows (65535->0), which is
static unsigned char int_count = INTS_PER_SECOND;
                                   // approximately 19 times per second for
    if(--int_count==0) {           // this program.
      if(seconds == 255) seconds = 0;
      ++seconds;
     
      int_count = INTS_PER_SECOND;
    }