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| Part Number | ATXMEGA256A3BU-MH | 
| Datasheet | ATXMEGA256A3BU-MH datasheet | 
| Description | IC MCU 8/16BIT 256KB FLASH 64QFN | 
| Manufacturer | Microchip Technology | 
| Series | AVR® XMEGA® A3BU | 
| 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 | 47 | 
| 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) | 1.6V ~ 3.6V | 
| Data Converters | A/D 16x12b; D/A 2x12b | 
| Oscillator Type | Internal | 
| Operating Temperature | -40°C ~ 85°C (TA) | 
| Package / Case | Surface Mount | 
| Supplier Device Package | 64-VFQFN Exposed Pad | 
| Base Part Number | 64-QFN (9x9) |