Her details of pins operation are explained.Flash memory: 256 KB of which 8 KB is used by the bootloader.DC current for 3.3V pin: 50 milliamperes.DC current for single I/O pinout: 20 milliamperes.
Digital I/O pins: 54 (fifteen are PWM outputs).The technical features of the Arduino Mega 2560 Rev3 are discussed here.Technical Features of Arduino Mega 2560 Rev3 It has eight kilobyte SRAM and four kilobyte EEPROM.Comes with fifty-four digital inputs and outputs with sixteen analog inputs.It comes with different features that are described here.
