/**
@defgroup    boards_arduino-uno Arduino Uno
@ingroup     boards
@brief       Support for the Arduino Uno board

## Overview

The Arduino Uno is one of the cheapest board to start and discover with
electronics and embedded coding. It is based on Atmel's AVR architecture and
sports an ATmega328p MCU. It is like many Arduinos extensible by using shields.

### MCU
| MCU        | ATmega328p        |
|:------------- |:--------------------- |
| Family | AVR/ATmega    |
| Vendor | Atmel |
| RAM        | 2Kb   |
| Flash      | 32Kb          |
| Frequency  | 16MHz |
| Timers | 3 (2x 8bit, 1x 16bit) |
| ADCs       | 6 analog input pins |
| UARTs      | 1                 |
| SPIs       | 1 |
| I2Cs       | 1 (called TWI)    |
| Vcc        | 5.0V          |
| Datasheet / Reference Manual   | [Datasheet and Reference Manual](http://www.atmel.com/images/atmel-8271-8-bit-avr-microcontroller-atmega48a-48pa-88a-88pa-168a-168pa-328-328p_datasheet_complete.pdf) |
| Board Manual   | [Board Manual](https://www.arduino.cc/en/Main/ArduinoBoardUno)|

## Flashing the device
Flashing RIOT on the Arduino Uno is quite straight forward, just connect your
Arduino Uno using the programming port to your host computer and type:

`make BOARD=arduino-uno flash`

This should take care of everything!

We use the open `avrdude` tool to write the new code into the ATmega328p's
flash

## Pin Change Interrupts

More pins can be used for hardware interrupts using the Pin Change
Interrupt feature. See @ref boards_common_atmega for details.

##Caution
Don't expect having a working network stack due to very limited resources.
 */