Часы Attiny2313

// tm1637 PB0 === CLK
// tm1637 PB1 === DIO
 
int i,i1,hh,mm,bb,brig;
 
void setup() {
  DDRB = 0b00000000; 
  PORTB |= (1 << 2) | (1 << 3) | (1 << 4);
   cli();  
  TCCR1A = 0;   
  TCCR1B = 0;   
  OCR1A = 18750; // 0.1 s
  TCCR1B |= (1 << WGM12); 
  TCCR1B |= (1 << CS11) | (1 << CS10);  // 64  
  TIMSK |= (1 << OCIE1A);  
   sei(); 
}
 
void loop() {
  if(hh * 100 + mm > 2300 || hh * 100 + mm < 600){brig = 1;}else{brig = 7;}
  print_time(hh * 100 + mm, bb, brig);// int число выводимое на индикатор, двоеточие, яркость от 0 до 7
  if(i1 <= 5){bb = 1;}else{bb = 0;}
 
  if(((PINB >> 2) & 1) == 0){mm++; if(mm>59){mm = 0;} delay(200);}
  if(((PINB >> 3) & 1) == 0){hh++; if(hh>23){hh = 0;} delay(200);}
  if(((PINB >> 4) & 1) == 0){i=0; delay(200);}
}
 
void tm_dec(byte dig){
       for(int i = 0; i < 8; i++) {
         DDRB |= (1 << 0);del();
       if (dig & 0x01)
         DDRB &= ~(1 << 1);
       else
         DDRB |= (1 << 1);del();
         DDRB &= ~(1 << 0);del();
         dig = dig >> 1;
  }
         DDRB |= (1 << 0);
         DDRB &= ~(1 << 1);del();
         DDRB &= ~(1 << 0);del();
 
       if (((PINB >> 1) & 1) == 0)
         DDRB |= (1 << 1);del();
         DDRB |= (1 << 0);del();
  }  
 
void tm_stop(){
         DDRB |= (1 << 1);del();
         DDRB &= ~(1 << 0);del();
         DDRB &= ~(1 << 1);del();
  }  
 
void tm_start(){
         DDRB |= (1 << 1);del();
  }
 
void print_time(int t, bool pd_t, int br){
        tm_start();tm_dec(0b10001000 + br);//tm_stop();tm_start();
        tm_dec(0x40);tm_stop();tm_start();
 
        int data0 = t / 1000;
        int data1 = t / 100 % 10;
        int data2 = t / 10 % 10;
        int data3 = t % 10;
 
      for(byte n = 0; n < 4; n++){
        int data;
      switch(n){
        case 0: data = data0;break;
        case 1: data = data1;break;
        case 2: data = data2;break;
        case 3: data = data3;break;
        }
 
      switch(data){  // XGFEDCBA
        case 0:  data = 0b00111111;break;     // 0
        case 1:  data = 0b00000110;break;     // 1
        case 2:  data = 0b01011011;break;     // 2
        case 3:  data = 0b01001111;break;     // 3
        case 4:  data = 0b01100110;break;     // 4
        case 5:  data = 0b01101101;break;     // 5
        case 6:  data = 0b01111101;break;     // 6
        case 7:  data = 0b00000111;break;     // 7
        case 8:  data = 0b01111111;break;     // 8
        case 9:  data = 0b01101111;break;     // 9
        }
 
        if(n == 0){data0 = data;}
        if(n == 1){data1 = data;}
        if(n == 2){data2 = data;}
        if(n == 3){data3 = data;}
        }
      if(pd_t == 1){data1+= 0b10000000;}
      tm_dec(0xC0);tm_dec(data0);tm_dec(data1);tm_dec(data2);tm_dec(data3);tm_stop();
}  
 
void del(){delayMicroseconds(100);}
 
ISR(TIMER1_COMPA_vect){
     i++;i1++;
     if(i1 > 9){i1 = 0;}
     if(i > 599){mm++;i = 0;}
     if(mm > 59){hh++;mm = 0;}
     if(hh > 23){hh = 0;}
     }