#include <REGX52.H>

#define TRUE 1

void main(void){
char tabID = 0;
char code tab[] = {0xFE, 0xFD, 0xFB, 0xF7};
char code values[4][3] = {{0x01,0x02,0x03},{0x04,0x05,0x06},{0x07,0x08,0x09},{0x0E,0,0x0F}};

while(TRUE)
{
    tabID = tabID%4;
    P1 = tab[tabID];

    if(P1 != tab[tabID])
    {
        if(P1_4==0) {
            P2 = values[tabID][0];
        }
        else if(P1_5==0){
            P2 = values[tabID][1];
        }
        else {
            P2 = values[tabID][2];
        }
    }
    tabID++;
}
}