Description：
The Arduino Due is a microcontroller board based on the Atmel SAM3X8E ARM Cortex-M3 CPU (datasheet).
It is the first Arduino board based on a 32-bit ARM core microcontroller.
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.
Note: Unlike other Arduino boards, the Arduino Due board runs at 3.3V.
The maximum voltage that the I/O pins can tolerate is 3.3V.
Providing higher voltages, like 5V to an I/O pin could damage the board.
Features:
Microcontroller: AT91SAM3X8E
Operating Voltage: 3.3V
Recommended Input Voltage: 7-12V
Min-Max Input Voltage: 6-20V
Digital I/O Pins: 54 (of which 12 provide PWM output)
Analog Input Pins: 12
Analog Outputs Pins: 2
Total DC Output Current on all I/O lines: 130 mA
DC Current for 3.3V Pin: 800 mA
DC Current for 5V Pin: 800 mA
Flash Memory: 512 KB all available for the user applications
SRAM: 96 KB (two banks: 64KB and 32KB)
Clock Speed: 84 MHz
