Microcontroller program that count the number of "ABC" & "XYZ"

#include REG52.h
char found1=0;
char found2=0;
char countABC=0;
char countXYZ=0;

void searchABCXYZ () interrupt 4
{
    if (RI==1)
    {
        if (SBUF=='A')
        {
            found1=1;
        }

        else if ((SBUF=='B')&& (found1==1))
        {
            found1=2;
        }

        else if ((SBUF=='C')&& (found1==2))
        {
            countABC++;
            found1=0;
        }

        else
            found1=0;
        P0=countABC;

        if (SBUF=='X')
        {
            found2=1;
        }

        else if ((SBUF=='Y')&&(found2==1))
        {
            found2=2;
        }

        else if ((SBUF=='Z')&&(found2==2))
        {
            countXYZ++;
            found2=0;
        }
        else
            found2=0;

        P1=countXYZ;
        RI=0;
    }
}

    void main ()
    {
        P0=0x00;
        P1=0x00;
        TMOD=TMOD&0x0F;
        TMOD=TMOD|0x20;
        SCON=0x50;
        TH1=0xFD;
        TL1=0xFD;
        EA=1;
        ES=1;
        TR1=1;
        while (1)
            PCON=PCON|0x01;
    }

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