Here is a list of all related documentation pages:

Clock configuration
Fuse bytes
MCUConfig.h
Definitions model
Getting started
Macros
ADC.h
ATmega2560.h
AnalogComparator.h
Architecture.h
Bootloader.h
Clock.h
Config.h
CPU.h
Device.h
EEPROM.h
Electrical.h
Errata.h
ExternalInterrupts.h
Fuse.h
GPIO.h
Interrupts.h
JTAG.h
LockBits.h
Memory.h
PackagePins.h
Package.h
PinFunctions.h
Pin.h
Power.h
Programming.h
PWM.h
QTouch.h
RegisterBits.h
RegisterMap.h
Reset.h
RTC.h
SPI.h
Timer.h
TWI.h
USART.h
Watchdog.h
XMEM.h
Namespaces
No runtime implementation
Technical references