docs/fuse.txt

   1 Atmega32u4 Fuse/Lock Bits for Planck/Atomic/Preonic
   2 =========================
   3
   4         Low Fuse: 0x5E
   5         High Fuse: 0x99
   6         Extended Fuse: 0xF3
   7         Lock Byte: 0xFF
   8
   9
  10 ATMega168P Fuse/Lock Bits
  11 =========================
  12 This configuration is from usbasploader's Makefile.
  13
  14     HFUSE   0xD6
  15     LFUSE   0xDF
  16     EFUSE   0x00
  17     LOCK    0x3F(intact)
  18
  19 #---------------------------------------------------------------------
  20 # ATMega168P
  21 #---------------------------------------------------------------------
  22 # Fuse extended byte:
  23 # 0x00 = 0 0 0 0   0 0 0 0 <-- BOOTRST (boot reset vector at 0x1800)
  24 #                    \+/
  25 #                     +------- BOOTSZ (00 = 2k bytes)
  26 # Fuse high byte:
  27 # 0xd6 = 1 1 0 1   0 1 1 0
  28 #        ^ ^ ^ ^   ^ \-+-/
  29 #        | | | |   |   +------ BODLEVEL 0..2 (110 = 1.8 V)
  30 #        | | | |   + --------- EESAVE (preserve EEPROM over chip erase)
  31 #        | | | +-------------- WDTON (if 0: watchdog always on)
  32 #        | | +---------------- SPIEN (allow serial programming)
  33 #        | +------------------ DWEN (debug wire enable)
  34 #        +-------------------- RSTDISBL (reset pin is enabled)
  35 # Fuse low byte:
  36 # 0xdf = 1 1 0 1   1 1 1 1
  37 #        ^ ^ \ /   \--+--/
  38 #        | |  |       +------- CKSEL 3..0 (external >8M crystal)
  39 #        | |  +--------------- SUT 1..0 (crystal osc, BOD enabled)
  40 #        | +------------------ CKOUT (if 0: Clock output enabled)
  41 #        +-------------------- CKDIV8 (if 0: divide by 8)
  42
  43
  44 # Lock Bits
  45 # 0x3f = - - 1 1   1 1 1 1
  46 #            \ /   \-/ \-/
  47 #             |     |   +----- LB 2..1 (No memory lock features enabled)
  48 #             |     +--------- BLB0 2..1 (No restrictions for SPM or LPM accessing the Application section)
  49 #             +--------------- BLB1 2..1 (No restrictions for SPM or LPM accessing the Boot Loader section)
  50