atmega8:
    low fuse byte:
        clock-source external xtal: CHKSEL = 0

    -> default: 0xe1
       new:     0b11100000 = 0xe0

    high fuse byte:
        512 words bootloader size: BOOTSZ0 = 1
                                   BOOTSZ1 = 0

        reset vector, jump to bootloader on reset: BOOTRST = 0

        no eeprom erase on chip erase: EESAVE = 0

    -> default: 0b11011001 = 0xd9
       new:     0b11010010 = 0xd2

    lock byte:
        SPM is not allowed to write to the Boot Loader section BLB12 = 1
                                                               BLB11 = 0

    -> default: 0b111111 = 0x3f
       new:     0b101111 = 0x2f


atmega88/168:
    low fuse byte:
        clock-source external xtal: CHKSEL = 0

        disable system clock divide by 8: CKDIV8 = 1

    -> default: 0b01100010 = 0x62
       new:     0b11100000 = 0xe0


    high fuse byte:
        no eeprom erase on chip erase: EESAVE = 0

    -> default: 0b11011111 = 0xdf
       new:     0b11010111 = 0xd7


    extended fuse byte:
        512 words bootloader size: BOOTSZ0 = 1
                                   BOOTSZ1 = 0

        OR:
        1024 words bootloader size: BOOTSZ0 = 0
                                    BOOTSZ1 = 0

        reset vector, jump to bootloader on reset: BOOTRST = 0

    -> default: 0b001 = 0x01
       new:     0b010 = 0x02 OR 0x00

    lock byte:
        SPM is not allowed to write to the Boot Loader section BLB12 = 1
                                                               BLB11 = 0

    -> default: 0b111111 = 0x3f
       new:     0b101111 = 0x2f

atmega32:
    high fuse byte
        - enable jtag unprogram: JTAGEN = 1
        - bootloader size 512 words: BOOTSZ1 = 1
                                     BOOTSZ0 = 0
        - jump to bootloader: BOORST = 0

    ->  default: 0b10011001 = 0x99
        neu:     0b11011100 = 0xdc

    low fuse byte:
        - external crystal clock, fast rising power: CKSEL = 1111

    ->  default: 0b11100001 = 0xe1
        neu:     0b11101111 = 0xef

    lock byte:
        SPM is not allowed to write to the Boot Loader section BLB12 = 1
                                                               BLB11 = 0

    -> default: 0b111111 = 0x3f
       new:     0b101111 = 0x2f

atmega644:
    high fuse byte

        - enable jtag unprogram: JTAGEN = 1
        - bootloader size 1024 words: BOOTSZ1 = 1
                                      BOOTSZ0 = 0
        - jump to bootloader: BOORST = 0

    ->  default: 0b10011001 = 0x99
        neu:     0b11011100 = 0xdc

    low fuse byte:

        - external crystal clock, fast rising power: CKSEL3..0 = 0111
                                                     SUT1..0 = 10
        - (unprogram) CKDIV8 = 1

    ->  default: 0b01100010 = 0x62
        neu:     0b11100111 = 0xe7

    lock byte:
        SPM is not allowed to write to the Boot Loader section BLB12 = 1
                                                               BLB11 = 0

    -> default: 0b111111 = 0x3f
       new:     0b101111 = 0x2f