+ * <td><b>Define Name:</b></td>\r
+ * <td><b>Location:</b></td>\r
+ * <td><b>Description:</b></td>\r
+ * </tr>\r
+ * <tr>\r
+ * <td>SIGNATURE_0, SIGNATURE_1, SIGNATURE_2</td>\r
+ * <td>Makefile CDEFS</td>\r
+ * <td>AVR part signature bytes. These are normally defined as part of the AVR device header files in recent avr-libc\r
+ * distributions. If your avr-libc library is out of date and does not define these values, you can define them\r
+ * manually in the makefile CDEFS.</td>\r