thanku charles
but i have already mentioned that i have included the file lcdaccess.h . the main problem is that the program is measuring time and the timer t1 is counting pulses but the timer o T0 is going into indefinite loop at the last while loop. it is not coming back to
for (d = 0; d < 20; d++)
{
DELAY_HARDWARE_50ms();
}

it is getiing interrupted by the overflow interrupt TF0 but when it returns it is not going to the above for loop but again going to the while loop.
i think you understand my problem.

and the #include statement is right #include<AT89S8252.h>
it is defined in kiel microvision.
and the flag statment also can be replaced with if(!TF0) etc . then also it is not working


please help