you aksing for freq is been provided by controller to clk pin of 0808???
in the code:
TMOD=0x22; //timer0 setting for generating clock of 500KHz using interrupt enable mode.
TH0=0xFD;
IE=0x82;
TR0=1;
i hope thiss will solve your problem… or plz a bit more specify your self.. xtcally what you asking….