unsigned char a;
void main (void)
{
DDRD|=(1<<7);
PORTB|=(1<<1);
while(1)
{
if(!(PINB&(1<<1))) for(a=0; a<254; a++) {PORTD|=(1<<7); delay_ms(2); PORTD&=~(1<<7); delay_ms(2);}
}
}

// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: Off
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=0x00;
UCSRB=0x08;
UCSRC=0x06;
UBRRH=0x00;
UBRRL=0x33;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;

while (1)
      {
      sprintf (buffer, "%d,%d,%d,%d,%d,%d,%d,%d",PINB.0,PINB.1,PINB.2,PINB.3,PINB.4,PINB.5,PINB.6,PINB.7); 
      printf ("%s",buffer);
      printf ("\n");
      delay_ms(1000);
      };
}

/*****************************************************
Chip type               : ATtiny2313
AVR Core Clock frequency: 8,000000 MHz
Memory model            : Tiny
External RAM size       : 0
Data Stack size         : 32
*****************************************************/
#include <tiny2313.h>
#include <delay.h>
#include <stdio.h>

unsigned int st = 0;

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

// External Interrupt 1 service routine
interrupt [EXT_INT1] void ext_int1_isr(void){
}

void PwmOff() {   // выключение ножки
  PORTB=0x00;
  DDRB=0x00;
}

void PwmOn() {  // включение ножки
 DDRB=0x04;
}

void main(void)
{

#pragma optsize-
CLKPR=0x80;
CLKPR=0x00;
#ifdef _OPTIMIZE_SIZE_
#pragma optsize+
#endif

// Func2=In Func1=In Func0=In
// State2=T State1=T State0=T
PORTA=0x00;
DDRA=0x00;

// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=Out Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=0 State1=T State0=T
PORTB=0x00;
DDRB=0x04;

// Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out Func0=Out
// State6=0 State5=0 State4=0 State3=0 State2=0 State1=0 State0=0
PORTD=0x00;
DDRD=0x7F;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: 125,000 kHz
// Mode: Fast PWM top=FFh
// OC0A output: Non-Inverted PWM
// OC0B output: Disconnected
TCCR0A=0x83;
TCCR0B=0x03;
TCNT0=0x00;
OCR0A=0x00;
OCR0B=0x00;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: 125,000 kHz
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x03;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;

// External Interrupt(s) initialization
// INT0: On
// INT0 Mode: Low level
// INT1: On
// INT1 Mode: Low level
// Interrupt on any change on pins PCINT0-7: Off
 // было
GIMSK=0xC0;
MCUCR=0x00;
EIFR=0xC0;
//MCUCR=0x00;
//GIMSK=0x40;
//GIFR=0x40;

// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;

// Universal Serial Interface initialization
// Mode: Disabled
// Clock source: Register & Counter=no clk.
// USI Counter Overflow Interrupt: Off
USICR=0x00;

// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=0x00;
UCSRB=0x18;
UCSRC=0x06;
UBRRH=0x00;
UBRRL=0x33;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;

// Global enable interrupts

#asm("sei")

while (1)
      {
      // Place your code here
        OCR0A = 50; //ШИМ нога - PB2       

        if(st>200)
         PwmOff();
         
        if(st>500)
          {
          st=0;
          PwmOn();

        // проверка включения выключения ШИМ
        if(PINB.3==1)
         PwmOff();
        if(PINB.3==0)
         PwmOn();

        delay_ms(10);     
       };
}