interupt problem with PCA

Hi,

I have written a interuppt program for 1 second time delay. I am inserting the code with this mail, I am using pca with timer0 overflow as time base for pca. the timer 0 overflows at every 250us which is inturn given to PCA with 4000 times count. The code is working fine as single module , but when I attach this code with my on going project code the code is not working, I have not used any special registers of the chip AT89C51ED2, and in all EEPROM programs I have used EA=0 and EA=1 at begining and end of program. If there is any suggestion , plz help me to get out of this problem.

void timer_routine(void) interrupt 7  using 2
{
    EA=0;        //disable all interrupt
    CL=0x5F;     //loading 0xfo5f to pca counter
    CH=0xF0;
    CCF1=0;      //clearing capture compare flag
    CF=0;        //clearing pca counter overflow flag
    P2_6=~P2_6;     //complementing the portpin
    EA=1;           //enable all interrupt
}

void main()
{


                IEN0=0xC0;  //enable all interupt and pca interupt
                TMOD |=0x02; //set timer0 as timer
                TL0=0x00;   //reload timer value as 0x1800
                TH0=0x18;
                TF0=0;
                CMOD=0x05;  //select timer 0 as pca clock and enable pca capture interupt
                CCAP1L=0x0A; //filling non zero values
                CCAP1H= 0x4F;
                CCAPM1=0x49;  //setting ecom1 and mat1 and eccf1bits to use as software timer and enabling capture interupt
                CL=0x5F;   // filling the pca timer
                CH=0xF0;
                CCAP1L=0xFF; //filling the capture ,compare modules
                CCAP1H= 0xFF;
                TR0=1;    //run timer0
                CR=1;    //run pca timer
                P2_6=0;



                while(1);

}