=================== AVR fuses setting =================== :Author: Ni AVR devices are shipped with fuses programmed to run on the internal 1 MHz oscillator. Please be very careful when programming fuses as a bad setup can make the AVR hard to program again. Here are the settings used at APBTeam: ====== ===== ===== ===== Device lfuse hfuse efuse ====== ===== ===== ===== m8 0xff 0xc1 -- m16 0xff 0xc1 -- m32 0xff 0xc1 -- m64 0xff 0xc1 0xff m128 0xff 0xc1 0xff usb128 0xff 0xd1 0xf3 ====== ===== ===== ===== This correspond to ('!' means unprogrammed, i.e. '1'): === === === === ==== ====== ======= m8 m16 m32 m64 m128 usb128 Meaning === === === === ==== ====== ======= l7 l7 l7 l7 l7 .. !BODLEVEL (BOD trigger level) l6 l6 l6 l6 l6 .. !BODEN (BOD enabled) .. .. .. .. .. l7 !CKDIV8 (divide clock by 8) .. .. .. .. .. l6 !CKOUT (clock output) l5 l5 l5 l5 l5 l5 !SUT1 (start up time) l4 l4 l4 l4 l4 l4 !SUT0 (start up time) l3 l3 l3 l3 l3 l3 !CKSEL3 (clock source select) l2 l2 l2 l2 l2 l2 !CKSEL2 (clock source select) l1 l1 l1 l1 l1 l1 !CKSEL1 (clock source select) l0 l0 l0 l0 l0 l0 !CKSEL0 (clock source select) --- --- --- --- ---- ------ ------- h7 .. .. .. .. .. !RSTDISBL (no reset pin disabled) .. h7 h7 h7 h7 h7 !OCDEN (OCD enabled) h6 .. .. .. .. .. !WDTON (no watchdog always on) .. h6 h6 h6 h6 h6 !JTAGEN (JTAG enabled) h5 h5 h5 h5 h5 h5 SPIEN (spi programming enabled) h4 h4 h4 h4 h4 .. CKOPT (clock option) .. .. .. .. .. h4 !WDTON (watchdog always on) h3 h3 h3 h3 h3 h3 EESAVE (eeprom preserved on chip erase) h2 h2 h2 h2 h2 h2 BOOTSZ1 (boot size) h1 h1 h1 h1 h1 h1 BOOTSZ0 (boot size) h0 h0 h0 h0 h0 h0 !BOOTRST (use boot reset vector) --- --- --- --- ---- ------ ------- .. .. .. e1 e1 !M103C (ATmega103 compatibility) .. .. .. e0 e0 !WDTON (watchdog always on) .. .. .. .. .. e3 HWBE (hardware boot enable) .. .. .. .. .. e2 BODLEVEL2 (brown-out detector select) .. .. .. .. .. e1 !BODLEVEL1 (brown-out detector select) .. .. .. .. .. e0 !BODLEVEL0 (brown-out detector select) === === === === ==== ====== ======= - CKSEL321 = 111, CKOPT = 0 corresponds to external crystal, more than 1 MHz. - CKSEL0 = 1, SUT10 = 11 corresponds to crystal, slowly rising power, this is the longest start-up time. In the future, we should try to enable BOD (Brown Out Detector) to fix EEPROM corruption problems.