Hello all,
I am trying to control six servo motors using an 8051 chip. I am using a code similar to the code posted by Mr . Adam Klaum here http://www.8052.com/forumchat/read/97655

However, I noticed that the above code works seamlessly only for 3 servo motors. If I try to interface even a single motor more to the above code, the other servos start behaving erratically.
What could be the problem?

I have also tried using Timer0 for the first three servos and Timer 1 for the 4th servo motor. Still, the same result.

Why could this be happening?
Also,what can I do in such a case?

P.S: I am using a P89v51RD2. I am aware that multiple PWM patterns can be generated using a certain PCA timer. I tried searching for the PCA cookbook on the net. But most of the links are dead. It would be great if somebody could post a fresh link for the above.