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ATXMEGA192A3U-MH

8/16-bit Atmel XMEGA A3U Microcontroller

Atmel Corporation 

XMEGA A3U

3. Overview

The Atmel® AVR® XMEGA® is a family of low power, high performance and peripheral rich 8/16-

bit microcontrollers based on the AVR® enhanced RISC architecture. By executing instructions

in a single clock cycle, the AVR achieves throughputs CPU approaching 1 Million Instructions

Per Second (MIPS) per MHz allowing the system designer to optimize power consumption ver-

sus processing speed.

Atmel AVR CPU combines a rich instruction set with 32 general purpose working registers. All

the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two indepen-

dent registers to be accessed in one single instruction, executed in one clock cycle. The

resulting architecture is more code efficient while achieving throughputs many times faster than

conventional single-accumulator or CISC based microcontrollers.

The XMEGA A3U devices provide the following features: In-System Programmable Flash with

Read-While-Write capabilities, Internal EEPROM and SRAM, four-channel DMA Controller,

eight-channel Event System, Programmable Multi-level Interrupt Controller, 50 general purpose

I/O Pins, 16-bit Real Time Counter, seven flexible 16-bit Timer/Counters with compare and

PWM channels, one USB 2.0 full speed (12Mbps) Device Interface, seven USARTs, two Two

Wire Serial Interfaces (TWIs), three Serial Peripheral Interfaces (SPIs), AES and DES crypto

engine, two 8-channel 12-bit ADCs with optional differential input with programmable gain, one

2-channel 12-bit DACs, four analog comparators with window mode, programmable Watchdog

Timer with separate Internal Oscillator, accurate internal oscillators with PLL and prescaler and

programmable Brown-Out Detection.

The Program and Debug Interface (PDI), a fast 2-pin interface for programming and debugging,

is available. The devices also have an IEEE std. 1149.1 compliant JTAG test interface, and this

can also be used for On-chip Debug and programming.

All XMEGA devices have five software selectable power saving modes. The Idle mode stops the

CPU while allowing the SRAM, DMA Controller, Event System, Interrupt Controller and all

peripherals to continue functioning. The Power-down mode saves the SRAM and register con-

tents but stops the oscillators, disabling all other functions until the next TWI or pin-change

interrupt, or Reset. In Power-save mode, the asynchronous Real Time Counter continues to run,

allowing the application to maintain a timer base while the rest of the device is sleeping. In

Standby mode, the Crystal/Resonator Oscillator is kept running while the rest of the device is

sleeping. This allows very fast start-up from external crystal combined with low power consump-

tion. In Extended Standby mode, both the main Oscillator and the Asynchronous Timer continue

to run. To further reduce power consumption, the peripheral clock to each individual peripheral

can optionally be stopped in Active mode and Idle sleep mode.

Atmel offers a free QTouch® library for embedding capacitive touch buttons, sliders and wheels

functionality into AVR microcontrollers.

The device is manufactured using Atmel's high-density nonvolatile memory technology. The pro-

gram Flash memory can be reprogrammed in-system through the PDI or JTAG. A Bootloader

running in the device can use any interface to download the application program to the Flash

memory. The Bootloader software in the Boot Flash section will continue to run while the Appli-

cation Flash section is updated, providing true Read-While-Write operation. By combining an

8/16-bit RISC CPU with In-System Self-Programmable Flash, the Atmel XMEGA A3U is a pow-

erful microcontroller family that provides a highly flexible and cost effective solution for

embedded applications.

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8386A–AVR–07/11

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