ATMEGA328 U

 High Performance, Low Power Atmel®AVR® 8-Bit Microcontroller Family
 Advanced RISC Architecture
̶ 131 Powerful Instructions – Most Single Clock Cycle Execution
̶ 32 x 8 General Purpose Working Registers
̶ Fully Static Operation
̶ Up to 20 MIPS Throughput at 20MHz
̶ On-chip 2-cycle Multiplier
High Endurance Non-volatile Memory Segments
-32KBytes of In-System Self-Programmable Flash program memory
̶ 256/512/512/1KBytes EEPROM
̶ 512/1K/1K/2KBytes Internal SRAM
̶ Write/Erase Cycles: 10,000 Flash/100,000 EEPROM
̶ Data retention: 20 years at 85C/100 years at 25C(1)
̶ Optional Boot Code Section with Independent Lock Bits
-In-System Programming by On-chip Boot Program
-True Read-While-Write Operation
̶ Programming Lock for Software Security
 Atmel® QTouch® library support
̶ Capacitive touch buttons, sliders and wheels
̶ QTouch and QMatrix® acquisition
̶ Up to 64 sense channels
 Peripheral Features
̶ Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode
̶ One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and
Capture Mode
̶ Real Time Counter with Separate Oscillator
̶ Six PWM Channels
̶ 8-channel 10-bit ADC in TQFP and QFN/MLF package
 Temperature Measurement
̶ 6-channel 10-bit ADC in PDIP Package
 Temperature Measurement
̶ Programmable Serial USART
̶ Master/Slave SPI Serial Interface
̶ Byte-oriented 2-wire Serial Interface (Philips I2C compatible)
̶ Programmable Watchdog Timer with Separate On-chip Oscillator
̶ On-chip Analog Comparator

̶ Interrupt and Wake-up on Pin Change

 Special Microcontroller Features
̶ Power-on Reset and Programmable Brown-out Detection
̶ Internal Calibrated Oscillator
̶ External and Internal Interrupt Sources
̶ Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby