// configure clock divider
  ADMODB |= 0x40;

  // set adc1 channel pins to input only (disables digital output)
  // channel 3
  P0M1 |= 0x10;
  P0M2 &= ~0x10;
  // disable dac1
  ADMODB &= ~0x08;
  // configure adc1 and enable (also enables dac1)
  ADCON1 |= 0x44;