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How To Declare \'Alternate Function\' vs GPIO

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enliteneer:
  How do you tell the micro-c compiler that you want to use the pin as a general purpose i/o versus use a  alternative function (like pwm)..
   
 For example, the PWM uses pins CEX0-CEX4, and according to the 8051 datasheet, the port pin must be set to to \'1\' inorder for the pwm to drive it.
 HOWEVER, If I set the bit this way, "setbit(1.3)", this will configure it as an \'input\', right?
 
Is there another way to initialize a port for gpio+direction and alternative function?

vitaliy:
Please read
http://www.bipom.com/cgi-bin/yabb/YaBB.pl?board=8051;action=display;num=1114595527

setbit(P1.3) ;// input or weak pull-up output
clrbit(P1.3); // low output

vitaliy:
here is PWM example
http://www.bipom.com/support/PWM.zip

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