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ATXMEGA256A3-MH Datasheet(PDF) 7 Page - ATMEL Corporation

Part # ATXMEGA256A3-MH
Description  8/16-bit AVR XMEGA A3 Microcontroller
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATXMEGA256A3-MH Datasheet(HTML) 7 Page - ATMEL Corporation

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7
8068R–AVR–08/10
XMEGA A3
6.
AVR CPU
6.1
Features
8/16-bit high performance AVR RISC Architecture
– 138 instructions
– Hardware multiplier
32x8-bit registers directly connected to the ALU
Stack in RAM
Stack Pointer accessible in I/O memory space
Direct addressing of up to 16M bytes of program and data memory
True 16/24-bit access to 16/24-bit I/O registers
Support for 8-, 16- and 32-bit Arithmetic
Configuration Change Protection of system critical features
6.2
Overview
The XMEGA A3 uses an 8/16-bit AVR CPU. The main function of the AVR CPU is to ensure cor-
rect program execution. The CPU must therefore be able to access memories, perform
calculations and control peripherals. Interrupt handling is described in a separate section. Figure
6-1 on page 7 shows the CPU block diagram.
Figure 6-1.
CPU block diagram
The AVR uses a Harvard architecture - with separate memories and buses for program and
data. Instructions in the program memory are executed with a single level pipeline. While one
instruction is being executed, the next instruction is pre-fetched from the program memory.
Flash
Program
Memory
Instruction
Decode
Program
Counter
OCD
32 x 8 General
Purpose
Registers
ALU
Multiplier/
DES
Instruction
Register
STATUS/
CONTROL
Peripheral
Module 1
Peripheral
Module 2
EEPROM
PMIC
SRAM
DATA BUS
DATA BUS


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