Hi,
I've asked this before, but never got a definitive answer... I have an ATMega2560-8AU chip that I want to make a standalone circuit from. Its given speed is 8MHz, not the normal 16MHz.
If I make a new board profile in boards.txt based on the current 2560 one, such as;
##############################################################
mega2560.name=Arduino Mega 2560
mega2560.upload.protocol=stk500v2
mega2560.upload.maximum_size=258048
mega2560.upload.speed=115200
mega2560.bootloader.low_fuses=0xFF
mega2560.bootloader.high_fuses=0xD8
mega2560.bootloader.extended_fuses=0xFD
mega2560.bootloader.path=stk500v2
mega2560.bootloader.file=stk500boot_v2_mega2560.hex
mega2560.bootloader.unlock_bits=0x3F
mega2560.bootloader.lock_bits=0x0F
mega2560.build.mcu=atmega2560
mega2560.build.f_cpu=8000000L
mega2560.build.core=arduino
##############################################################
what will this effect? Do I also have to fiddle with the bootloader somehow? The datasheet says that the timer fuse settings won't change (apparently there is one setting for an external xtal at 8-16MHz).
Thanks
Tom