ATSAMG54N19 NVM user row & fuses
A SAM chip has no fuse bytes: its start-up settings are words in the flash's user row and the factory's calibration rows, at the addresses shown. The user row sets the bootloader protection, the EEPROM emulation area, the brown-out detector and the watchdog at power-on; the program reads them, and a programmer writes them. Microchip's file gives no factory values for these words, so they start at all ones (an erased row): the datasheet's NVM User Row table has the values the chip ships with. Change a setting and the word below updates.
GPNVMBITS · 0x00000000 0xFF erased: no factory value in the file BOOT_MODE Boot Mode Selection 1 · on 0 · off SECURITY_BIT Security Bit 1 · on 0 · off Lock bits 0xFFFFFFFF erased: no factory value in the file LOCK_REGION_30 Lock Region 30 1 · on 0 · off LOCK_REGION_29 Lock Region 29 1 · on 0 · off LOCK_REGION_28 Lock Region 28 1 · on 0 · off LOCK_REGION_27 Lock Region 27 1 · on 0 · off LOCK_REGION_26 Lock Region 26 1 · on 0 · off LOCK_REGION_25 Lock Region 25 1 · on 0 · off LOCK_REGION_24 Lock Region 24 1 · on 0 · off LOCK_REGION_23 Lock Region 23 1 · on 0 · off LOCK_REGION_22 Lock Region 22 1 · on 0 · off LOCK_REGION_21 Lock Region 21 1 · on 0 · off LOCK_REGION_20 Lock Region 20 1 · on 0 · off LOCK_REGION_19 Lock Region 19 1 · on 0 · off LOCK_REGION_18 Lock Region 18 1 · on 0 · off LOCK_REGION_17 Lock Region 17 1 · on 0 · off LOCK_REGION_16 Lock Region 16 1 · on 0 · off LOCK_REGION_15 Lock Region 15 1 · on 0 · off LOCK_REGION_14 Lock Region 14 1 · on 0 · off LOCK_REGION_13 Lock Region 13 1 · on 0 · off LOCK_REGION_12 Lock Region 12 1 · on 0 · off LOCK_REGION_11 Lock Region 11 1 · on 0 · off LOCK_REGION_10 Lock Region 10 1 · on 0 · off LOCK_REGION_9 Lock Region 9 1 · on 0 · off LOCK_REGION_8 Lock Region 8 1 · on 0 · off LOCK_REGION_7 Lock Region 7 1 · on 0 · off LOCK_REGION_6 Lock Region 6 1 · on 0 · off LOCK_REGION_5 Lock Region 5 1 · on 0 · off LOCK_REGION_4 Lock Region 4 1 · on 0 · off LOCK_REGION_3 Lock Region 3 1 · on 0 · off LOCK_REGION_2 Lock Region 2 1 · on 0 · off LOCK_REGION_1 Lock Region 1 1 · on 0 · off LOCK_REGION_0 Lock Region 0 1 · on 0 · off LOCK_REGION_31 Lock Region 31 1 · on 0 · off Lock bits 0xFFFFFFFF erased: no factory value in the file LOCK_REGION_62 Lock Region 62 1 · on 0 · off LOCK_REGION_61 Lock Region 61 1 · on 0 · off LOCK_REGION_60 Lock Region 60 1 · on 0 · off LOCK_REGION_59 Lock Region 59 1 · on 0 · off LOCK_REGION_58 Lock Region 58 1 · on 0 · off LOCK_REGION_57 Lock Region 57 1 · on 0 · off LOCK_REGION_56 Lock Region 56 1 · on 0 · off LOCK_REGION_55 Lock Region 55 1 · on 0 · off LOCK_REGION_54 Lock Region 54 1 · on 0 · off LOCK_REGION_53 Lock Region 53 1 · on 0 · off LOCK_REGION_52 Lock Region 52 1 · on 0 · off LOCK_REGION_51 Lock Region 51 1 · on 0 · off LOCK_REGION_50 Lock Region 50 1 · on 0 · off LOCK_REGION_49 Lock Region 49 1 · on 0 · off LOCK_REGION_48 Lock Region 48 1 · on 0 · off LOCK_REGION_47 Lock Region 47 1 · on 0 · off LOCK_REGION_46 Lock Region 46 1 · on 0 · off LOCK_REGION_45 Lock Region 45 1 · on 0 · off LOCK_REGION_44 Lock Region 44 1 · on 0 · off LOCK_REGION_43 Lock Region 43 1 · on 0 · off LOCK_REGION_42 Lock Region 42 1 · on 0 · off LOCK_REGION_41 Lock Region 41 1 · on 0 · off LOCK_REGION_40 Lock Region 40 1 · on 0 · off LOCK_REGION_39 Lock Region 39 1 · on 0 · off LOCK_REGION_38 Lock Region 38 1 · on 0 · off LOCK_REGION_37 Lock Region 37 1 · on 0 · off LOCK_REGION_36 Lock Region 36 1 · on 0 · off LOCK_REGION_35 Lock Region 35 1 · on 0 · off LOCK_REGION_34 Lock Region 34 1 · on 0 · off LOCK_REGION_33 Lock Region 33 1 · on 0 · off LOCK_REGION_32 Lock Region 32 1 · on 0 · off LOCK_REGION_63 Lock Region 63 1 · on 0 · off 
BETA