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Can anybody explain me of this ckt?

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sajeev

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Hi
I have a ckt like this.I think its a voltage regulator.I am using pic16f628a in the board.The pics vdd pin(14) is connected to the ckt vdd.This ckt is powered from 9v battery.I getting exactly 5v at pin 14.PICs 17th and 18th pin are connected to this ckt.I am getting 5v at 14th pin only if I make the pin 17 as o/p and make 17th pin high.If its low voltage at 14th pin is 0v.But whats the purpose of 18th pin.In what way I can controll this ckt by using pic.

Expecting your suggestions and answers....
Regards..
 

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