This document describes a high-performance, low-power AVR 8/16-bit XMEGA microcontroller with non-volatile program and data memories, external bus interfaces for up to 128M bytes of SDRAM, and other features.
The ATxmega256A3 is a low‑power, high‑performance 8/16‑bit AVR microcontroller with a rich set of peripherals, including DMA, event system, multiple timers, USARTs, ADCs, DACs and crypto engines. It offers up to 256 KB of flash, 16 KB of SRAM and 4 KB of EEPROM, and operates from 1.8 V to 3.6 V.
The document details ordering information, pin‑out diagrams for TQFP and MLF packages, block diagrams of the CPU and peripheral architecture, memory organization, electrical characteristics, and packaging data. It also references additional application notes and development tools available from Atmel's website.
| Flash Memory | 64 KB – 256 KB |
|---|---|
| SRAM | 4 KB – 16 KB |
| EEPROM | 2 KB – 4 KB |
| Maximum Clock Speed | 0‑32 MHz (depending on voltage) |
| USARTs | 7 |
| DAC Channels | One 2‑channel, 12‑bit DAC (1 Msps) |
| Timer/Counters | Seven 16‑bit timers |
| Programmable I/O Lines | 50 |
It provides between 64 KB and 256 KB of In‑System Self‑Programmable Flash memory.
The microcontroller offers 50 programmable I/O lines.