아래부분이 초 부분이고  위의 부분이 분 부분이에요. 위의 회로의 아래 버튼을 한번 누르면 초부분이 깜박이고 두번누르면 정지가 됩니다. 그리고 위의버튼을 한번 누르면 시간변경이 되고 두번을 누르면 깜빡이면서 시간수정이 되는 코드를 만들고 싶은데요. 기초 코드는 이거에요 
#include 
unsigned char KEY1_NOWs, KEY1_OLDs, KEY2_NOWs, KEY2_OLDs , ;
  signed char NUM1, NOM2 , MUNs ,NUM0, NUMBER = 0; 
unsigned int mSEC = 0;
unsigned char SECs, SEC0,SEC1,MINs,MIN1,MIN0 ;
unsigned char HORs, HOR1, HOR0,HOR2, DAYs,DAY1,DAY0;
unsigned char MODE = 0;
unsigned int KEY1_NUMs = 0, KEY2_NUMs = 0 ,  ;
interrupt [TIM2_OVF] void timer2_ovf_isr(void)
{
  TCNT2=0x06;
  
  KEY1_OLDs = KEY1_NOWs ; KEY1_NOWs = PINA.0 ;// KEYs_NOWs = PINA ;
  KEY2_OLDs = KEY2_NOWs ; KEY2_NOWs = PINA.1 ;
  
 // if((KEY1_OLDs == 0 ) && (KEY1_NOWs == 1)) {NUMBER += 1 ; }
 // if((KEY2_OLDs == 0 ) && (KEY2_NOWs == 1)) {NUMBER -= 1 ; }
  
  mSEC +=1;
  if(mSEC < 500)      {PORTB.2 = 1;}
  else if(mSEC < 999) {PORTB.2 = 0;}
  else                 {mSEC = 0; SECs +=1 ;}
  
  
  PORTB.0 = 1 ; PORTD = MIN1*16 + MIN0 ;
  PORTB.1 = 1 ; PORTE = SEC1*16 + SEC0 ;
  
  if(SECs > 59) {SECs = 0 ; MINs += 1;}
  if(MINs > 59) {MINs = 0 ; HORs += 1;}
  if(HORs > 23) {HORs = 0 ; DAYs += 1;}
  
  SEC1 = SECs / 10;
  SEC0 = SECs % 10;
  
  MIN1 = MINs / 10;
  MIN0 = MINs % 10;
  
  HOR1 = HORs /10;
  HOR0 = HORs %10; 
 
  PORTB.0 =1 ; PORTD = MIN1*16 + MIN0 ; // PORTD = NUM1 << 4) + NUM0 ;
   // PORTD = KEY_NOWs;
   // PORTB.1 = 1 ; PORTE = SEC1*16 + SEC0 ;
  if (mSEC < 500) {PORTB.1 = 1 ; PORTE = SEC1*16 + SEC0 ; }
  else            {PORTB.1 = 0 ; PORTE = SEC1*16 + SEC0 ; } 
 
 }
void main(void)
{
// Declare your local variables here
 
// Input/Output Ports initialization
// Port A initialization
// Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In 
DDRA=(0<)>
// State: Bit7=T Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
PORTA=(0<)>
 
// Port B initialization
// Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In 
DDRB=(0<)>
// State: Bit7=T Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
PORTB=(0<)>
 
// Port C initialization
// Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In 
DDRC=(0<)>
// State: Bit7=T Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
PORTC=(0<)>
 
// Port D initialization
// Function: Bit7=Out Bit6=Out Bit5=Out Bit4=Out Bit3=Out Bit2=Out Bit1=Out Bit0=Out 
DDRD=(1<)>
// State: Bit7=0 Bit6=0 Bit5=0 Bit4=0 Bit3=0 Bit2=0 Bit1=0 Bit0=0 
PORTD=(0<)>
 
// Port E initialization
// Function: Bit7=Out Bit6=Out Bit5=Out Bit4=Out Bit3=Out Bit2=Out Bit1=Out Bit0=Out 
DDRE=(1<)>
// State: Bit7=0 Bit6=0 Bit5=0 Bit4=0 Bit3=0 Bit2=0 Bit1=0 Bit0=0 
PORTE=(0<)>
 
// Port F initialization
// Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In 
DDRF=(0<)>
// State: Bit7=T Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
PORTF=(0<)>
 
// Port G initialization
// Function: Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In 
DDRG=(0<)>
// State: Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
PORTG=(0<)>
 
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=0xFF
// OC0 output: Disconnected
ASSR=0<;<>
TCCR0=(0<)>
TCNT0=0x00;
OCR0=0x00;
 
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer1 Stopped
// Mode: Normal top=0xFFFF
// OC1A output: Disconnected
// OC1B output: Disconnected
// OC1C output: Disconnected
// 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
// Compare C Match Interrupt: Off
TCCR1A=(0<)>
TCCR1B=(0<)>
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
OCR1CH=0x00;
OCR1CL=0x00;
 
// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: 250.000 kHz
// Mode: Normal top=0xFF
// OC2 output: Disconnected
// Timer Period: 1 ms
TCCR2=(0<)>
TCNT2=0x06;
OCR2=0x00;
 
// Timer/Counter 3 initialization
// Clock source: System Clock
// Clock value: Timer3 Stopped
// Mode: Normal top=0xFFFF
// OC3A output: Disconnected
// OC3B output: Disconnected
// OC3C output: Disconnected
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer3 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
// Compare C Match Interrupt: Off
TCCR3A=(0<)>
TCCR3B=(0<)>
TCNT3H=0x00;
TCNT3L=0x00;
ICR3H=0x00;
ICR3L=0x00;
OCR3AH=0x00;
OCR3AL=0x00;
OCR3BH=0x00;
OCR3BL=0x00;
OCR3CH=0x00;
OCR3CL=0x00;
 
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=(0<)>
ETIMSK=(0<)>
 
// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
// INT3: Off
// INT4: Off
// INT5: Off
// INT6: Off
// INT7: Off
EICRA=(0<)>
EICRB=(0<)>
EIMSK=(0<)>
 
// USART0 initialization
// USART0 disabled
UCSR0B=(0<)>
 
// USART1 initialization
// USART1 disabled
UCSR1B=(0<)>
 
// Analog Comparator initialization
// Analog Comparator: Off
// The Analog Comparator's positive input is
// connected to the AIN0 pin
// The Analog Comparator's negative input is
// connected to the AIN1 pin
ACSR=(1<)>
SFIOR=(0<);<>
 
// ADC initialization
// ADC disabled
ADCSRA=(0<)>
 
// SPI initialization
// SPI disabled
SPCR=(0<)>
 
// TWI initialization
// TWI disabled
TWCR=(0<)>
 
// Globally enable interrupts
#asm("sei")
 
while (1)
      {
      
 
      }
}
뭘 어떻게 해야할지 전혀 감을 못잡고 있어요 . 그래서 c언어 책을 보았지만 이해가 잘안돼서 어떻게 해야 할지 잘모르겠어요. 도와주세요. 제발