At 200us motor hasn't run smoothly.
Now ,i wish to control 2 motors at the same
time and 100 machine cycles in timer interrupt is not enough to do it ( 2 motors are more code in interrupt and ofcourse more time).
I think 200 cycles is enough.
In my opinion use timer0 and timer1 for every motor at 100 cycles is not good.
So i wonder if i use @24Mhz i can fix my problem.Can i do that ?

Use a derivative with a PCA such as the P89C51Rx2 or P89C66x.
That will allow you full control.

Erik

Ps a link to the datasheets is in links <---under interesting sites. The link Philips appnotes is good for datasheets, appnotes and other material.