The Atmega328P is at the centre of every Arduino Uno board and acts as the 8-bit microcontroller that controls and interacts with sensors, motors, relays, and other electronic devices. The ATmega328P-U shown here is a dual in-line package microchip that can be placed on a breadboard, making it ideal for projects that require enclosure, or prototypes moving beyond the development board phase. The ATmega328P-U is also a great selection for Internet of Things (IoT) development, as its inherent power consumption is very low without LEDs or regulators.

• High-performance, Low-power AVR 8-bit Microcontroller
• Advanced RISC Architecture
  • 131 Powerful Instructions - Most Single Clock Cycle Execution
  • 32 x 8 General Purpose Working Registers
  • Up to 6 MIPS Throughput at 16MHz
  • Fully Static Operation
  • On-chip 2-cycle Multiplier
• Nonvolatile Program and Data Memories
  • 32k Bytes of In-System Self-Programmable Flash
  • Optional Boot Code Section with Independent Lock Bits
  • 1K Bytes EEPROM
  • Programming Lock for Software Security
• Peripheral Features
  • On-chip Analog Comparator
  • Programmable Watchdog Timer with Seperate On-chip Oscillator
  • Master/Slave SPI Serial Interface
  • Two 8-bit Timer/Counters with Separate Prescalar, Compare 
  • One 16-bit TImer/Counter with Seperate Prescaler, Compare and Capture mode
  • Real TIme Counter with Seperate Oscillator
  • Six PWM Channels
  • 8-channel, 10-bit ADC
  • Byte-oriented Two-wire Serial Interface
  • Programmable Serial USART
• Special Mircocontroller Features
  • Power-on Reset and Programmable Brown-out Detection
  • Internal Calibrated RC Oscillator
  • External and Internal Interrupt Sources
  • Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby
• I/O and Packages
  • 23 Programmable I/O Lines
  • 28-pin PDIP, 32-lead TQFP, and 28-pad MLF
• Operating Voltages
  • 1.8-5.5V for ATmega328P
• Speed Grades
  • 0-20 MHz for ATmega328P
• Power Consumption at 1 Mhz, 1.8V, 25 °C
  • Active: 0.2mA
  • Power-down Mode: 0.1µA