void main (void)
{
   /*-----------------------------------------------
   Configure the serial port
   -----------------------------------------------*/
   SCON  = 0x50;
   TMOD |= 0x20;
   TH1   = 0xFA;
   TR1   = 1;
   TI    = 1;
   PCON |= 0x80;

   ADC0CON = 0x07;
   SF = 0x0D;


   while (1)
   {
      unsigned int conv_val;

      /*-----------------------------------------------
      Start a conversion and wait for it to complete.
      -----------------------------------------------*/
      ADCMODE |= 0x22;        /*Enables Primary ADC*/
      while (RDY0 != 1);
      RDY1 = 0;               /*Ready bit for PRIMARY ADC */

      /*-----------------------------------------------
      Read A/D data and print it out.
      -----------------------------------------------*/
      conv_val = ADC0M | ((ADC0H) << 8);

  
      printf ("Primary ADC Channel 3 = %urn", conv_val);
   }

}