#include <tiny13.h>
#include <delay.h>   

unsigned int RP100MS = 0;
unsigned int timer = 0;
unsigned int temp = 0;
unsigned int calc = 0;

// External Interrupt 0 service routine
interrupt [EXT_INT0] void ext_int0_isr(void)
{
RP100MS++;
}

// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
if (timer == 59) {
        RP100MS = temp;
        timer = 0;     
        RP100MS = 0;
        }
else {
timer++;
};
}

void main(void)
{

// Crystal Oscillator division factor: 1
#pragma optsize-
CLKPR=0x80;
CLKPR=0x00;
#ifdef _OPTIMIZE_SIZE_
#pragma optsize+
#endif

// Input/Output Ports initialization
// Port B initialization
// Func5=In Func4=In Func3=In Func2=Out Func1=In Func0=In
// State5=T State4=T State3=T State2=0 State1=T State0=T
PORTB=0x00;
DDRB=0x04;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: 150.000 kHz
// Mode: Normal top=FFh
// OC0A output: Disconnected
// OC0B output: Disconnected
TCCR0A=0x00;
TCCR0B=0x03;
TCNT0=0x00;
OCR0A=0x00;
OCR0B=0x00;

// External Interrupt(s) initialization
// INT0: On
// INT0 Mode: Falling Edge
// Interrupt on any change on pins PCINT0-5: Off
GIMSK=0x40;
MCUCR=0x02;
GIFR=0x40;

// Timer/Counter 0 Interrupt(s) initialization
TIMSK0=0x02;

// Analog Comparator initialization
// Analog Comparator: Off
ACSR=0x80;
ADCSRB=0x00;

// Global enable interrupts
#asm("sei")

while (1)
      {   
      calc = temp/1,25 // ((temp / 0,5) /2,5) пауза половину периода и коэффициент деления
     
      PORTB.2 = 0;
      delay_ms(calc);
      PORTB.2 = 1;
      delay_ms(calc);

      };
}

calc = temp/1,25