Servo CS

Hi All ,

i have a servo motor CS-67 Hobbico.....i need to control it using PIC16f877.

i'm using CrownHill Proton and i wrote a aprogram using ' Servo pin,position'

so my program looks like that:
------------------

device 16f877

low portb.6

servo portb.6,1500

delayms 2000
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but it dosen't work at all.
can you tell me why ?