+ * to the ADC. <i>Ignored when compiled for targets lacking an ADC, or when NO_VTARGET_DETECT is defined.</i></td>
+ * </tr>
+ * <tr>
+ * <td>VTARGET_USE_INTERNAL_REF</td>
+ * <td>Makefile LUFA_OPTS</td>
+ * <td>Selects the internal 2.56V ADC reference voltage, instead of using the AVR's VREF pin. When enabled, this option will
+ * override the VTARGET_REF_VOLTS configuration option. <i>Ignored when compiled for targets lacking an ADC, or when
+ * NO_VTARGET_DETECT is defined.</i></td>