pic ile xor entegre kontrolü.

#include <htc.h>
#ifndef _XTAL_FREQ
#define _XTAL_FREQ 4000000
#endif
void
main(void)
{    TRISB=0xFF;
    PORTB=0;
    TRISC=0x0F;
    PORTC=0;
    TRISD=0;
    PORTD=0;
    char dogruluktablosu[4]={0,1,1,0};
    while (1){
        if(RC0){
        char flag=0;
        for(char i=0;i<4;i++){
        PORTD=i;
        if(RB0!=dogruluktablosu[i]) break;
        else flag+=1;
        }
        for(char i=0;i<4;i++){
            PORTD=i*4;
            if(RB1!=dogruluktablosu[i]) break;
            else flag+=1;
            }
        for(char i=0;i<4;i++){
            PORTD=i*16;
            if(RB2!=dogruluktablosu[i]) break;
            else flag+=1;
            }
        for(char i=0;i<4;i++){
            PORTD=i*64;
            if(RB3!=dogruluktablosu[i]) break;
            else flag+=1;
            }       
        if(flag==16)RC4=1;
            else RC5=1;
    }   
}