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servo motor

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I would like to know how to move a servo motor from a microprocessor.
im using zylog for training but i forgot what is the serial because it belongs to the school.

my instructor also dont know how to move a servo motor.
(well it actually moves but it is not doing what we want to happen)

our servo motor have 3 pin for vcc,ground and a signal.

we don't know what to feed to the signal, we are just feeding a some sort of frequency, but we don't know what is the right frequency to move it the way we want..

can anyone help me, or explain to me how?
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