git.zerfleddert.de Git - fnordlicht-mini/blob - firmware/fuses.txt

   1 fnordlicht original hardware
   2 ===========================================================================
   3
   4 atmega8:
   5     low fuse byte:
   6         clock-source external xtal: CHKSEL = 0
   7
   8     -> default: 0xe1
   9        new:     0b11100000 = 0xe0
  10
  11     high fuse byte (with bootloader, leave at 0xd9 for use without bootloader):
  12         512 words bootloader size: BOOTSZ0 = 1
  13                                    BOOTSZ1 = 0
  14
  15         reset vector, jump to bootloader on reset: BOOTRST = 0
  16
  17     -> default: 0b11011001 = 0xd9
  18        new:     0b11011010 = 0xda
  19
  20     lock byte:
  21
  22         SPM is not allowed to write to the Boot Loader section BLB12 = 1
  23                                                                BLB11 = 0
  24     -> default: 0x3f
  25        new:     0x2f
  26
  27
  28 atmega88/168:
  29     low fuse byte:
  30         clock-source external xtal: CHKSEL = 0
  31
  32         disable system clock divide by 8: CKDIV8 = 1
  33
  34     -> default: 0b01100010 = 0x62
  35        new:     0b11100000 = 0xe0
  36
  37
  38     high fuse byte:
  39         no eeprom erase on chip erase: EESAVE = 0
  40
  41     -> default: 0b11011111 = 0xdf
  42        new:     0b11010111 = 0xd7
  43
  44
  45     extended fuse byte:
  46         1024 words bootloader size: BOOTSZ0 = 0
  47                                     BOOTSZ1 = 0
  48
  49         reset vector, jump to bootloader on reset: BOOTRST = 0
  50
  51     -> default: 0x01
  52        new:     0x00
  53
  54     lock byte:
  55         SPM is not allowed to write to the Boot Loader section BLB12 = 1
  56                                                                BLB11 = 0
  57
  58     -> default: 0b111111 = 0x3f
  59        new:     0b101111 = 0x2f
  60
  61
  62 fnordlichtmini hardware
  63 ===========================================================================
  64
  65 atmega8:
  66     low fuse byte:
  67         clock-source external xtal: CHKSEL[1..3] = 111
  68         slowly rising power, 65ms startup timeout: CHKSEL[0] = 1, SUT[0..1] = 11
  69         enable brown-out detector: BODEN = 0
  70         require ~4v for safe operation: BODLEVEL = 0
  71
  72     -> default: 0xe1
  73        new:     0b00111111 = 0x3f
  74
  75     high fuse byte (with bootloader, leave at 0xd9 for use without bootloader):
  76         512 words bootloader size: BOOTSZ0 = 1
  77                                    BOOTSZ1 = 0
  78
  79         reset vector, jump to bootloader on reset: BOOTRST = 0
  80
  81     -> default: 0b11011001 = 0xd9
  82        new:     0b11011010 = 0xda
  83
  84     lock byte:
  85
  86         SPM is not allowed to write to the Boot Loader section BLB12 = 1
  87                                                                BLB11 = 0
  88     -> default: 0x3f
  89        new:     0x2f
  90
  91
  92 fnordlicht-controller
  93 ==========================================================================
  94
  95 atmega168:
  96     low fuse byte:
  97         clock-source external xtal: CHKSEL = 0111
  98
  99         disable system clock divide by 8: CKDIV8 = 1
 100
 101     -> default: 0b01100010 = 0x62
 102        new:     0b11100111 = 0xe7
 103
 104
 105     high fuse byte:
 106
 107     -> default: 0b11011111 = 0xdf
 108
 109
 110     extended fuse byte:
 111         1024 words bootloader size: BOOTSZ0 = 0
 112                                     BOOTSZ1 = 0
 113
 114         reset vector, jump to bootloader on reset: BOOTRST = 0
 115
 116     -> default: 0b001 = 0x01
 117        new:     0b000 = 0x00
 118
 119
 120     lock byte:
 121         SPM is not allowed to write to the Boot Loader section BLB12 = 1
 122                                                                BLB11 = 0
 123
 124     -> default: 0b111111 = 0x3f
 125        new:     0b101111 = 0x2f