I am running a 8052 using serial port, to generate a frequency. Timer1 is used for the serial port.

Timer2 is using the autoreload mode and Timer 0 as 16 bit counter.

The problem is that i have to reload TH0 and TL0 everytime Timer0 overflows.

The frequency on timer 0 is always below the expected value, when timer2 is on. When timer2 is off, the frequency is as required.

How can i avoid the problem. Is it something to do with where i place the command
mov TH0,#0FFh
mov TL0,#33h.

Thnx, i really need a accurate freq.