ATxmega32C4 fuses & lock bits
The fuse bytes set the clock, start-up, brown-out and boot options; the lock bits protect flash and EEPROM. A fuse bit is programmed at 0 . Change a setting and the byte below updates; the starting values are the factory defaults.
FUSEBYTE1 fuse 0x00 default 0x00 WDWPER Watchdog Window Timeout Period 8 cycles (8ms @ 3.3V) 16 cycles (16ms @ 3.3V) 32 cycles (32ms @ 3.3V) 64 cycles (64ms @ 3.3V) 128 cycles (0.125s @ 3.3V) 256 cycles (0.25s @ 3.3V) 512 cycles (0.5s @ 3.3V) 1K cycles (1s @ 3.3V) 2K cycles (2s @ 3.3V) 4K cycles (4s @ 3.3V) 8K cycles (8s @ 3.3V) WDPER Watchdog Timeout Period 8 cycles (8ms @ 3.3V) 16 cycles (16ms @ 3.3V) 32 cycles (32ms @ 3.3V) 64 cycles (64ms @ 3.3V) 128 cycles (0.125s @ 3.3V) 256 cycles (0.25s @ 3.3V) 512 cycles (0.5s @ 3.3V) 1K cycles (1s @ 3.3V) 2K cycles (2s @ 3.3V) 4K cycles (4s @ 3.3V) 8K cycles (8s @ 3.3V) FUSEBYTE2 fuse 0xFF default 0xFF BOOTRST Boot Loader Section Reset Vector Boot Loader Reset Application Reset TOSCSEL Timer Oscillator pin location TOSC1 / TOSC2 on separate pins TOSC1 / TOSC2 shared with XTAL1 / XTAL2 BODPD BOD Operation in Power-Down Mode BOD enabled in sampled mode BOD enabled continuously BOD Disabled FUSEBYTE4 fuse 0xFF default 0xFF RSTDISBL External Reset Disable 1 · unprogrammed 0 · programmed STARTUPTIME Start-up Time 64 ms 4 ms 0 ms WDLOCK Watchdog Timer Lock 1 · unprogrammed 0 · programmed FUSEBYTE5 fuse 0xFF default 0xFF BODACT BOD Operation in Active Mode BOD enabled in sampled mode BOD enabled continuously BOD Disabled EESAVE Preserve EEPROM Through Chip Erase 1 · unprogrammed 0 · programmed BODLEVEL Brownout Detection Voltage Level 3.0 V 2.8 V 2.6 V 2.4 V 2.2 V 2.0 V 1.8 V 1.6 V Lock bits 0xFF default 0xFF BLBB Boot Lock Bits - Boot Section Read and write not allowed Read not allowed Write not allowed No locks BLBA Boot Lock Bits - Application Section Read and write not allowed Read not allowed Write not allowed No locks BLBAT Boot Lock Bits - Application Table Read and write not allowed Read not allowed Write not allowed No locks LB Lock Bits Read and write not allowed Write not allowed No locks 
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