Overview
The XMEGA A4 is a family of low power, high performance and peripheral rich CMOS 8/16-bit microcontrollers based on the AVR® enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the XMEGA A4 achieves throughputs approaching 1 Million Instructions Per Second (MIPS) per MHz allowing the system designer to optimize power consumption versus processing speed.

FEATUREs
• High-performance, Low-power AVR 8/16-bit AVR XMEGA Microcontroller
• Non-volatile Program and Data Memories
   – 16K - 128K Bytes of In-System Self-Programmable Flash
   – 4K Boot Code Section with Independent Lock Bits
   – 1K - 2K Bytes EEPROM
   – 2K - 8K Bytes Internal SRAM
• Peripheral Features
   – Four-channel DMA Controller with support for external requests
   – Eight-channel Event System
   – Five 16-bit Timer/Counters
      Three Timer/Counters with 4 Output Compare or Input Capture channels
      Two Timer/Counters with 2 Output Compare or Input Capture channels
      High-Resolution Extensions on all Timer/Counters
      Advanced Waveform Extension on one Timer/Counter
   – Five USARTs
      IrDA Extension on one USART
   – Two Two-Wire Interfaces with dual address match (I2C and SMBus compatible)
   – Two SPIs (Serial Peripheral Interfaces) peripherals
   – AES and DES Crypto Engine
   – 16-bit Real Time Counter with Separate Oscillator
   – One Twelve-channel, 12-bit, 2 Msps Analog to Digital Converter
   – One Two-channel, 12-bit, 1 Msps Digital to Analog Converter
   – Two Analog Comparators with Window compare function
   – External Interrupts on all General Purpose I/O pins
   – Programmable Watchdog Timer with Separate On-chip Ultra Low Power Oscillator
• Special Microcontroller Features
   – Power-on Reset and Programmable Brown-out Detection
   – Internal and External Clock Options with PLL
   – Programmable Multi-level Interrupt Controller
   – Sleep Modes: Idle, Power-down, Standby, Power-save, Extended Standby
   – Advanced Programming, Test and Debugging Interfaces
      PDI (Program and Debug Interface) for programming, test and debugging
• I/O and Packages
   – 34 Programmable I/O Lines
   – 44-lead TQFP
   – 44-pad MLF
• Operating Voltage
   – 1.6 – 3.6V
• Speed performance
   – 0 – 12 MHz @ 1.6 – 2.7V
   – 0 – 32 MHz @ 2.7 – 3.6V

Typical Applications
• Industrial control
• Climate control
• Hand-held battery applications
• Factory automation
• ZigBee
• Power tools
• Building control
• Motor control
• HVAC
• Board control
• Networking
• Metering
• White Goods
• Optical
• Medical Applications