마이크로프로세서 HOTlcd시계 커는 소스입니다.. 해석좀 부탁 드려요 ~

/**********************************************************************
*
*                              main.c
*
*
*
***********************************************************************/

#include <iom2560.h>
#include <stdio.h>
#include <intrinsics.h>

unsigned char sec1;
unsigned char sec2;
unsigned char sec3;
unsigned char min1;
unsigned char min2;
unsigned char hour1;
unsigned char hour2;

void init_lcd(void)
{
  DDRL = 0xff;
  DDRC = 0xff;

  PORTC = 0x04;
  PORTL = 0x38;
  __delay_cycles (8000);
  PORTC = 0x03;

  PORTC = 0x04;
  PORTL = 0x38;
  __delay_cycles (8000);
  PORTC = 0x03;

  PORTC = 0x04;
  PORTL = 0x38;
  __delay_cycles (8000);
  PORTC = 0x03;

  PORTC = 0x04;
  PORTL = 0x0c;
  __delay_cycles (8000);
  PORTC = 0x03;

  PORTC = 0x04;
  PORTL = 0x06;
  __delay_cycles (8000);
  PORTC = 0x03;

  PORTC = 0x04;
  PORTL = 0x02;
  __delay_cycles (8000);
  PORTC = 0x03;

  PORTC = 0x04;
  PORTL = 0x01;
  __delay_cycles (8000);
  PORTC = 0x03;
}

void write(unsigned int addr, unsigned int str)
{
  PORTC = 0x04;
  PORTL = addr;
  __delay_cycles (8000);
  PORTC = 0x03;

  PORTC = 0x06;
  PORTL = str;
  __delay_cycles (8000);
  PORTC = 0x03;
}

void init_timer1(void)
{
 OCR1AH = 0x2C; 
 OCR1AL = 0xFF;
 TCCR1B = 0x0B; 
        TIMSK1 = 0x02;
}

#pragma vector = TIMER1_COMPA_vect
__interrupt void timer1_compa()
{
 sec1++;
}

void init_clock()
{
  sec1 = 0x30;
  sec2 = 0x30;
  sec3 = 0x30;
  min1 = 0x30;
  min2 = 0x30;
  hour1 = 0x30;
  hour2 = 0x30;
}

void main(void)
{
  init_clock();
  SREG|=0x80;
  init_timer1();
  init_lcd();

  while(1)
  {
    write(0x89, sec1); SET RAM CONTROL
    write(0x88, 0x2e); SET_RAM_ADDRESS_CONTROL     
    write(0x87, sec2);
    write(0x86, sec3); SET_PARTIAL_DISPLAY CONTROL 
    write(0x85, 0x3a);
    write(0x84, min1);
    write(0x83, min2);
    write(0x82, 0x3a);
    write(0x81, hour1);
    write(0x80, hour2);
    if (sec1>0x39){sec1 = 0x30; sec2++;}
    if (sec2>0x39){sec2 = 0x30; sec3++;}
    if (sec3>0x35){sec3 = 0x30; min1++;}
    if (min1>0x39){min1 = 0x30; min2++;}
    if (min2>0x35){min2 = 0x30; hour1++;}
    if (hour2 == 0x30 & hour1>0x39){hour1 = 0x30; hour2 = 0x31;}
    if (hour2 == 0x31 & hour1>0x39){hour1 = 0x30; hour2 = 0x32;}
    if (hour2 == 0x32 & hour1>0x33){hour1 = 0x30; hour2 = 0x30;}
  }

}