• The Arduino/Genuino Uno can be programmed with the (Arduino Software (IDE)). Select "Arduino/Genuino Uno from the Tools > Board menu (according to the microcontroller on your board). For details, see the reference and tutorials.The ATmega328 on the Arduino/Genuino Uno comes preprogrammed with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the original STK500 protocol (reference, C header files). You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header using Arduino ISP or similar; see these instructions for details.

•  Speed(MHz) 16MHZ
•  Core Size (Number of Bits) 8 Bit
•  RAM Size 2KBYTE
•  ROM Type EEPROM Flash
•  Number of Pins 28

Other Detail:

• Microcontroller    ATmega328P
• Input Voltage (recommended)    7-12V
• Input Voltage (limit)    6-20V
• Digital I/O Pins    14 (of which 6 provide PWM output)
• PWM Digital I/O Pins    6
• Analog Input Pins    6
• DC Current per I/O Pin    20 mA
• DC Current for 3.3V Pin    50 mA
• Flash Memory    32 KB (ATmega328P)
• of which 0.5 KB used by bootloader
• SRAM    2 KB (ATmega328P)
• EEPROM    1 KB (ATmega328P)
• Clock Speed    16 MHz
• LED_BUILTIN    13