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Interfacing AVR Tiny231 with keyboard PC PS2

#include <tiny2313a.h>
           // Alphanumeric LCD functions
#include <alcd.h>
#include <stdlib.h>
#include <delay.h>
           // Declare your global variables here
unsigned char clock_cache = 0,heksa_tombol = 0,val=0,nilai=0,nil1=0,nil2=0,nil3=0;
char snilai[7];
int niltot=0;
void button_exec()
{
           //lcd_clear();
           val=heksa_tombol;
           if(val==22){nilai=1;}
           if(val==30){nilai=2;}
           if(val==38){nilai=3;}
           if(val==37){nilai=4;}
           if(val==46){nilai=5;}
           if(val==54){nilai=6;}
           if(val==61){nilai=7;}
           if(val==62){nilai=8;}
           if(val==70){nilai=9;}
           if(val==69){nilai=0;}
           
}
interrupt [EXT_INT0] void ext_int0_isr(void)
{
 // Place your code here
 clock_cache++;
 if(clock_cache==0x0b)
 {
           button_exec();clock_cache = 0;heksa_tombol=0;
 }
 else if(clock_cache>0x01)
 {
  if(PIND.3==1)
  {
   switch(clock_cache)
   {
           case 0x02:
           heksa_tombol++;break;
           case 0x03:
           heksa_tombol = heksa_tombol + 2;break;
           case 0x04:
           heksa_tombol = heksa_tombol + 4;break;
           case 0x05:
           heksa_tombol = heksa_tombol + 8;break;
           case 0x06:
           heksa_tombol = heksa_tombol + 16;break;
           case 0x07:
           heksa_tombol = heksa_tombol + 32;break;
           case 0x08:
           heksa_tombol = heksa_tombol + 64;break;
           case 0x09:
           heksa_tombol = heksa_tombol + 128;break;
   }
  }
 }
}
void main(void)
{
           // Declare your local variables here
// Crystal Oscillator division factor: 1
           #pragma optsize-
           CLKPR=0x80;
           CLKPR=0x00;
           #ifdef _OPTIMIZE_SIZE_
           #pragma optsize+
           #endif
// Input/Output Ports initialization
           // Port A initialization
           // Func2=In Func1=In Func0=In 
           // State2=T State1=T State0=T 
           PORTA=0x00;
           DDRA=0x00;
// Port B initialization
           // Func7=In Func6=In Func5=In Func4=In Func3=Out Func2=In Func1=In Func0=In            
           // State7=T State6=T State5=T State4=T State3=0 State2=T State1=T State0=T            
           PORTB=0x00;
           DDRB=0x08;
// Port D initialization
           // Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
           // State6=T State5=T State4=T State3=T State2=P State1=T State0=T 
           PORTD=0x06;
           DDRD=0x01;
// Timer/Counter 0 initialization
           // Clock source: System Clock
           // Clock value: Timer 0 Stopped
           // Mode: Normal top=0xFF
           // OC0A output: Disconnected
           // OC0B output: Disconnected
           TCCR0A=0x00;
           TCCR0B=0x00;
           TCNT0=0x00;
           OCR0A=0x00;
           OCR0B=0x00;
// Timer/Counter 1 initialization
           // Clock source: System Clock
           // Clock value: 8000,000 kHz
           // Mode: Fast PWM top=0x00FF
           // OC1A output: Non-Inv.
           // 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=0x81;
           TCCR1B=0x09;
           TCNT1H=0x00;
           TCNT1L=0x00;
           ICR1H=0x00;
           ICR1L=0x00;
           OCR1AH=0x00;
           OCR1AL=0x00;
           OCR1BH=0x00;
           OCR1BL=0x00;
// External Interrupt(s) initialization
           // INT0: On
           // INT0 Mode: Falling Edge
           // INT1: Off
           // Interrupt on any change on pins PCINT0-7: Off
           GIMSK=0x40;
           MCUCR=0x02;
           // 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
           // USART disabled
           UCSRB=0x00;
// Analog Comparator initialization
           // Analog Comparator: Off
           // Analog Comparator Input Capture by Timer/Counter 1: Off
           ACSR=0x80;
           DIDR=0x00;
// Alphanumeric LCD initialization
           // Connections are specified in the
           // Project|Configure|C Compiler|Libraries|Alphanumeric LCD menu:
           // RS - PORTB Bit 0
           // RD - PORTB Bit 1
           // EN - PORTB Bit 2
           // D4 - PORTB Bit 4
           // D5 - PORTB Bit 5
           // D6 - PORTB Bit 6
           // D7 - PORTB Bit 7
           // Characters/line: 8
           lcd_init(16);
// Global enable interrupts
#asm("sei")
while (1)
 {
  do {
     }
           while (val>0&&val<=224); 
           itoa(nilai,snilai);lcd_gotoxy(0,0);lcd_puts(snilai);
           delay_ms(25);
           do {
           }
           while (val>0&&val<=224); 
           itoa(nilai,snilai);lcd_gotoxy(1,0);lcd_puts(snilai);
           nil2=nilai*10;
           delay_ms(25);
           do {
           }
           while (val>0&&val<=224); 
           itoa(nilai,snilai);lcd_gotoxy(2,0);lcd_puts(snilai);
           nil3=nilai;
           delay_ms(25);
           niltot=nil1+nil2+nil3; 
  }
}