Atmega fuse calculator.
Written by Nick Gammon.
Version 1.11
Compiled on Dec 12 2019 at 10:33:54 with Arduino IDE 10809.
Attempting to enter programming mode ...
Entered programming mode OK.
Signature = 0x1E 0x98 0x01
Processor = ATmega2560
Flash memory size = 262144
LFuse = 0xFF
HFuse = 0xD8
EFuse = 0xFD
Lock byte = 0xEF
Clock calibration = 0xA2
OCD Enable.............................. [ ]
JTAG Enable............................. [ ]
Enable Serial (ICSP) Programming........ [X]
Watchdog Timer Always On................ [ ]
Preserve EEPROM through chip erase...... [ ]
Boot into bootloader.................... [X]
Divide clock by 8....................... [ ]
Clock output............................ [ ]
Bootloader size: 8192 bytes.
Start-up time: SUT0: [ ]  SUT1: [ ] (see datasheet)
Clock source: low-power crystal.
Brownout detection at: 2.7V.