ATXMEGA256A3U Datasheet, PDF (111/116 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA A3U Microcontroller

XMEGA A3U
Table of Contents
Features ..................................................................................................... 1
1 Ordering Information ............................................................................... 2
2 Pinout/Block Diagram .............................................................................. 3
3 Overview ................................................................................................... 4
3.1Block Diagram ...........................................................................................................5
4 Resources ................................................................................................. 6
4.1Recommended reading .............................................................................................6
5 Capacitive touch sensing ........................................................................ 6
6 AVR CPU ................................................................................................... 7
6.1Features ....................................................................................................................7
6.2Overview ...................................................................................................................7
6.3ALU - Arithmetic Logic Unit .......................................................................................8
6.4Program Flow ............................................................................................................8
6.5Register File ..............................................................................................................8
7 Memories .................................................................................................. 9
7.1Features ....................................................................................................................9
7.2Overview ...................................................................................................................9
7.3Flash Program Memory ...........................................................................................10
7.4Data Memory ...........................................................................................................11
7.5Production Signature Row .......................................................................................13
7.6User Signature Row ................................................................................................13
7.7Flash and EEPROM Page Size ...............................................................................14
8 DMAC - Direct Memory Access Controller .......................................... 15
8.1Features ..................................................................................................................15
8.2Overview .................................................................................................................15
9 Event System ......................................................................................... 16
9.1Features ..................................................................................................................16
9.2Overview .................................................................................................................16
10 System Clock and Clock options ......................................................... 18
10.1Features ................................................................................................................18
10.2Overview ...............................................................................................................18
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8386A–AVR–07/11