I'm not too sure of what your problem is, but anyhow....

You haven't shown us the values used to initialise the timer (TMOD,TCON).

The timer does continue to run after overflow - the TF1 flag tells us that is has overflowed.


Don't you want to wait until the timer has overflowed?

while (TF1 == 0) {}; //wait here until 50mS has elapsed
// execute code
// reload the timer


Normally if I want to add timer functions into my code (almost certainly), I use a timer to generate a periodic interrupt. This interrupt is normally around 10mS. In the interrupt routine you can decrement a value (or many values) down to 0.

timer1_isr:
{
TR1 = 0;
//reload timer with 10mS (or whatever)
TR1 = 1;

if (timer1_val)
{
timer1_val--;
}
if (timer2_val)
{
timer2_val--;
}
}

In your mainline code:

timer1_val = 5; //5 * 10 = 50mS
..
..
..
..
if (timer1_val == 0)
{
//execute routine every 50mS
timer1_val = 5; //5 * 10 = 50mS
}

I hope this explains the technique.






}