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Check this for better project "A 10-character display for the Elektor Flash Micro board" :
h**p://www.elektor-electronics.co.uk/Default.aspx?tabid=28&year=2003&month=11&art=50477
how brushless motor works pdf
You are right, you need an interrupt, that is time interrupt. This interrupt is generated 100 ms after counting the pulses input.
Just connect it to the external interrupt pin stated in your program, e.g. INT0 (P3.2) or INT1 (P3.3). Have a look at www.atmel.com/dyn/resources/prod_documents/doc0265.pdf
Re: control motor DC
I don't think it a specific dc motor control system. It is only analogies, how to convert mechanics into electric, or vice versa. It is usually used in simulation.
There are three pins from BJT : C,B, and E. Base (B) is the center of them. So, if you want to make BJT to be diode, you just take the B as one of your diode pin, and the other pin is up to you.
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