Part Number: ATXMEGA256A3U-MH

Manufacturer: Microchip Technology

Description: IC MCU 8/16BIT 256KB FLASH 64QFN

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of ATXMEGA256A3U-MH

Datasheet  ATXMEGA256A3U-MH datasheet
Category Integrated Circuits (ICs)
Family Embedded – Microcontrollers
Manufacturer Atmel
Series AVR? XMEGA? A3U
Packaging Tray
Part Status Active
Core Processor AVR
Core Size 8/16-Bit
Speed 32MHz
Connectivity I2C, IrDA, SPI, UART/USART, USB
Peripherals Brown-out Detect/Reset, DMA, POR, PWM, WDT
Number of I/O 50
Program Memory Size 256KB (128K x 16)
Program Memory Type FLASH
EEPROM Size 4K x 8
RAM Size 16K x 8
Voltage – Supply (Vcc/Vdd) 1.6 V ~ 3.6 V
Data Converters A/D 16x12b; D/A 2x12b
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Package / Case 64-VFQFN Exposed Pad
Supplier Device Package 64-QFN (9×9)


The ATXMEGA256A3U-MH from the Atmel AVR XMEGA series has been a game changer in the field of microcontrollers. This microcontroller, based on the AVR enhanced RISC architecture, packs a punch with its low power consumption, great performance, and a slew of diverse peripherals. In this in-depth overview, we’ll look at the ATXMEGA256A3U-MH microcontroller’s characteristics, capabilities, and applications.

Features and Functionalities of ATXMEGA256A3U-MH Microcontroller

The ATXMEGA256A3U-MH microcontroller from the Atmel AVR XMEGA family is a feature and functionality powerhouse. This section goes through the features that make this microcontroller a standout choice for a variety of applications.

Flash Memory and Read-While-Write

The microcontroller includes programmable flash memory with read-while-write capability. This means that the device can be updated with new program code while still executing previous code, allowing for seamless and uninterrupted programming activities.

Internal EEPROM and SRAM

The ATXMEGA256A3U-MH features inbuilt Electrically Erasable Programmable Read-Only Memory (EEPROM) and Static Random-Access Memory (SRAM) for efficient data storing and retrieval. Even when the power is switched off, the EEPROM ensures non-volatile storage of vital data.

DMA Controller and Event System

The microcontroller includes a four-channel Direct Memory Access (DMA) controller, which improves data transfer efficiency by allowing peripherals to access memory directly without requiring CPU intervention. The event system ensures that peripherals communicate smoothly, reducing CPU involvement and optimizing system efficiency.

Programmable Interrupt Controller

Interrupt management is critical for real-time applications. The ATXMEGA256A3U-MH’s programmable multilevel interrupt controller simplifies interrupt handling, allowing developers to effectively prioritize and manage multiple interrupts.

I/O Lines and Real-Time Counter

The microcontroller’s 50 general-purpose I/O connections provide plenty of versatility for interacting with external devices and sensors. For applications that require timekeeping capability, the embedded 16-bit Real-Time Counter (RTC) provides a solid time base.

Timer/Counters with Compare and PWM Channels

The inclusion of seven customizable 16-bit timer/counters with compare and PWM channels allows developers to precisely measure time intervals and generate exact PWM signals for applications such as motor control and lighting systems.

Cryptographic Engines: AES and DES

Modern applications place a premium on security. The AES (Advanced Encryption Standard) and DES (Data Encryption Standard) cryptographic engines on the microcontroller enable hardware-accelerated encryption and decryption, maintaining data secrecy.

Analog-to-Digital and Digital-to-Analog Converters

The microcontroller provides precise analog signal conversion with two 16-channel, 12-bit Analog-to-Digital Converters (ADCs) with configurable gain and a 2-channel 12-bit Digital-to-Analog Converter (DAC), making it appropriate for sensor interface and analog signal processing.

Analog Comparators and Watchdog Timer

Four analog comparators with a window mode allow analog signals to be compared, while the programmable watchdog timer improves system dependability by resetting the microcontroller in the event of software problems or system failures.

Oscillators: PLL and Prescaler

The ATXMEGA256A3U-MH microcontroller offers accurate internal oscillators with PLL and prescaler options, ensuring steady and precise clock sources for a variety of applications.

In essence, the ATXMEGA256A3U-MH microcontroller provides a comprehensive set of functions to meet a wide range of application requirements. This microcontroller is a versatile solution for a wide range of embedded systems and IoT applications, with capabilities ranging from efficient memory management to advanced communication interfaces and security features. Its combination of excellent performance and low power consumption distinguishes it as a trustworthy option for modern design difficulties.

Power Saving Modes of ATXMEGA256A3U-MH Microcontroller

The Atmel AVR XMEGA family’s ATXMEGA256A3U-MH microcontroller provides various power saving modes for optimal energy management. These modes address various conditions, allowing developers to reduce power usage while preserving functionality.

  • Idle Mode: This mode suspends the CPU while peripherals continue to operate, enabling for rapid responses to external events or interruptions.
  • Power-Down Mode: Turns off the CPU and oscillators while retaining SRAM and register contents. Activates in response to particular occurrences.
  • Power-Saving Mode: Maintains timing accuracy by keeping an asynchronous real-time counter running while other components sleep.
  • Standby Mode: Allows for quick startup from an external crystal, which is perfect for applications that require occasional wake-ups.
  • Extended Standby Mode: Maintains timing accuracy and power consumption by running major oscillators and timers.

These modes enable developers to build energy-efficient systems without sacrificing performance, making the ATXMEGA256A3U-MH suited for a wide range of low-power applications.

QTouch Library Integration

The ATXMEGA256A3U-MH microcontroller integrates seamlessly with the QTouch library, transforming user interfaces with capacitive touch functionality. This section delves into the advantages and implementation of touch buttons, sliders, and wheels with this powerful library.

Capacitive Touch Functionality

Capacitive touch technology has changed the way people interact with devices by providing intuitive and responsive interfaces. The ATXMEGA256A3U-MH microcontroller can sense touch without the use of typical mechanical buttons by leveraging the QTouch library. This results in more streamlined designs, increased durability, and improved user experiences.

Implementing Touch Buttons, Sliders, and Wheels

  • Touch Buttons: Using the QTouch library, it is simple to convert a defined area into a touch-sensitive button. Developers can determine the position and size of the button, as well as the sensitivity settings, by customizing the library. When engaged, the microcontroller recognizes touch inputs and allows you to perform actions like switching functions or browsing menus.
  • Touch Sliders: Using touch sliders, users can change values or settings with a simple swipe action. Developers can specify the length and sensitivity of the slider, resulting in a smooth and responsive experience. The QTouch library translates touch positions along the slider into meaningful data changes.
  • Touch Wheels: These simulate the rotation of a physical dial. Create a circular touch-sensitive zone and setup the QTouch library to recognize rotational motions. This enables users to modify values such as volume or scrolling without the use of any real moving parts.

Developers may design dynamic and engaging user interfaces that respond intuitively to touch by integrating the QTouch library with the ATXMEGA256A3U-MH microcontroller. The library simplifies the implementation of touch buttons, sliders, and wheels, boosting the capabilities of the microcontroller and opening the door to novel applications in a variety of sectors.

Programming and Debugging Interfaces

The ATXMEGA256A3U-MH has several programming and debugging interfaces. For these reasons, the Program and Debug Interface (PDI) and the IEEE 1149.1 compliant JTAG interface are provided. The bootloader allows for simple program updates in the flash memory.

Application Areas

The ATXMEGA256A3U-MH’s adaptability makes it an excellent solution for a wide range of applications, including embedded systems, IoT devices, consumer electronics, industrial automation, and automotive applications. Its low power consumption and extensive feature set lead to its widespread use.


Finally, the ATXMEGA256A3U-MH microcontroller epitomizes the exceptional characteristics of the Atmel AVR XMEGA family. Its harmonic combination of power efficiency, great performance, and a wide range of features makes it a highly versatile solution for a wide range of applications. The ATXMEGA256A3U-MH maintains its stable status as a dependable and adaptable solution, perfectly suited for the world of embedded systems and beyond.

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