It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, an ICSP header, and a reset button. The Micro board is similar to the Arduino Leonardo in that the ATmega32U4 has built-in USB communication, eliminating the need for a secondary processor. The Micro is a microcontroller board based on the ATmega32U4, developed in conjunction with Adafruit. To erase, press and hold the Erase button for a few seconds while the board is powered. This will remove the currently loaded sketch from the MCU. It is possible to erase the Flash memory of the SAM3X with the onboard erase button. The power source is selected automatically.

The Arduino Due can be powered via the USB connector or with an external power supply.

The board contains everything needed to support the microcontroller simply connect it to a computer with a micro-USB cable or power it with an AC-to-DC adapter or battery to get started. It has 54 digital input/output pins (of which 12 can be used as PWM outputs), 12 analog inputs, 4 UARTs (hardware serial ports), a 84 MHz clock, an USB OTG capable connection, 2 DAC (digital to analog), 2 TWI, a power jack, an SPI header, a JTAG header, a reset button and an erase button. It is the first Arduino board based on a 32-bit ARM core microcontroller. The Arduino Due is a microcontroller board based on the Atmel SAM3X8E ARM Cortex-M3 CPU.

Ramps 1.4 usb 2.0 serial driver