can any one provide me a cheap circuit diagram for interfacing stepper motor with 89c51.?

Question

i want my motor to rotate in both direction.

Answer 1

look you seem to be doing sem 5 engineering project.
there is a program available in " electrical measuring devices by A.K. SHAWNEY"
and u can also refer project books that would be in your library.
these books are in many volumes u can get it in some volume atleast
also electronics for you mazaine may have it

Answer 2

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Answer 3

Use a Stepper Motor Driver like http://www.onsemi.com/pub/Collateral/MC3479-D.PDF

and drive the leads from your processor.