// Play 220Hz on RC0

#include <pic18.h>

void main(void)
{
   unsigned int i;

   TRISA = 0;
   TRISB = 0;
   TRISC = 0;
   ADCON1 = 0x0F;
   PORTC = 0;
   
   while(1) {
      RC0 = !RC0;
      for(i=0; i<1419; i++);
      }
   }