ATMEGA328-PU 8bit AVR Microcontroller, 20MHz, 32 kB Flash, 28-Pin PDIP With Arduino Bootloader

ATMEGA328-PU Features:

• 20 MHz Max. Operating Frequency
  
• Up to 20 MIPS at 20 MHz
  
• 32 KB Flash
  
• 1024 B EEPROM
  
• 2 KB SRAM
  
• 131 Instructions ? Most single clock cycle execution
  
• 32 General Purpose Registers
  
• 23 GPIO
  
• Power-on Reset and Programmable Brown-out Detection
  
• Internal Calibrated Oscillator
  
• External and Internal Interrupt Sources
  
• Five Power-Saving Sleep Modes
  
• Internal and External Interrupts
  
• Fully Static Operation

Peripheral Features:

• 10-bit 15 ksps Analogue-to-Digital Converter (ADC) ? 8 or 6 channels
  
• Capacitive Touch Sense ? 16 channels
  
• Temperature Sensor
  
• Two 8-bit Timers
  
• One 16-bit Timer
  
• Output Compare Module ? 6 channels
  
• Six PWM Channels
  
• Programmable Serial USART
  
• Master/Slave SPI Serial Interface
  
• Byte-oriented 2-wire Serial Interface ? I2C compatible
  
• Programmable Watchdog Timer with Separate Oscillator
  
• Analogue Comparator
  
• Interrupt and Wake-up on Pin Change