#include <90s8535.h>  
#include <delay.h>                     
#include <stdio.h>
                   
// Alphanumeric LCD Module functions
#asm
   .equ __lcd_port=0x15
#endasm
#include <lcd.h>

unsigned char zehntelsek, sekunden, minuten, stunden,i;


interrupt [TIM1_OVF] void timer1_ovf_isr(void)
{
PORTB = ~PORTB;
if (zehntelsek < 9) ++zehntelsek;
else
    {
     zehntelsek = 0;
     if (sekunden < 59) ++sekunden;
     else
        {
        sekunden = 0;
        if (minuten < 59) ++minuten;
        else
           {
           minuten = 0;
           if (stunden < 23) ++stunden;
           else
              {
              stunden = 0;
              }
           }
        }
    }

}

void main(void)
{
// Declare your local variables here
char text[16];
// Input/Output Ports initialization
// Port A
PORTA=0x00;
DDRA=0x00;

// Port B
PORTB=0x00;
DDRB=0xFF;

// Port C
PORTC=0x00;
DDRC=0x00;

// Port D
PORTD=0x00;
DDRD=0x00;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Output Compare
// OC0 output: Disconnected
TCCR0=0x00;
TCNT0=0x00;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: 7,813 kHz
// Mode: 10 bit Pulse Width Modulation
// OC1A output: Non-Inv.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
TCCR1A=0x00;
TCCR1B=0x0B;
TCNT1H=0xAA;
TCNT1L=0xAA;
OCR1AH=0x33;
OCR1AL=0x33;
OCR1BH=0x33;
OCR1BL=0x33;


// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer 2 Stopped
// Mode: Output Compare
// OC2 output: Disconnected
TCCR2=0x00;
ASSR=0x00;
TCNT2=0x00;
OCR2=0x00;

// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
GIFR=0x00;
MCUCR=0x00;

// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x04;

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

// LCD module initialization
lcd_init(16);                         
#asm("sei")

while (1)
      {
        sprintf(text," %2u.%2u.%2u.%2u",stunden,minuten,sekunden,zehntelsek);
        lcd_gotoxy(0,1);
        lcd_puts(text);      
    
       
      };
}