ATXMEGA32D4-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATXMEGA32D4-CU

8/16-bit Atmel XMEGA D4 Microcontroller

Atmel Corporation 

XMEGA D4

6. AVR CPU

6.1 Features

• 8/16-bit, high-performance Atmel AVR RISC CPU

– 137 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 16MB of program memory and 16MB of data memory

• True 16/24-bit access to 16/24-bit I/O registers

• Efficient support for 8-, 16-, and 32-bit arithmetic

• Configuration change protection of system-critical features

6.2 Overview

All Atmel AVR XMEGA devices use the 8/16-bit AVR CPU. The main function of the CPU is to

execute the code and perform all calculations. The CPU is able to access memories, perform

calculations, control peripherals, and execute the program in the flash memory. Interrupt han-

dling is described in a separate section, refer to ”Interrupts and Programmable Multilevel

Interrupt Controller” on page 28.

6.3 Architectural Overview

In order to maximize performance and parallelism, the AVR CPU uses a Harvard architecture

with separate memories and buses for program and data. Instructions in the program memory

are executed with single-level pipelining. While one instruction is being executed, the next

instruction is pre-fetched from the program memory. This enables instructions to be executed on

every clock cycle. For details of all AVR instructions, refer to http://www.atmel.com/avr.

Figure 6-1. Block diagram of the AVR CPU architecture.

8

8135L–AVR–06/12

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