ATXMEGA128B3-AU ATMEL [ATMEL Corporation], ATXMEGA128B3-AU Datasheet - Page 8

• Manufacturer Part Number: ATXMEGA128B3-AU
• Description: 8/16-bit Atmel XMEGA B3 Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

6. AVR CPU
6.1
6.2
6.3
8074B–AVR–02/12
Features
Overview
Architectural Overview
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The Atmel
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
Interrupt Controller” on page
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.
8/16-bit, high-performance Atmel AVR RISC CPU
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
– 142 instructions
– Hardware multiplier
®
AVR
Block Diagram of the AVR CPU architecture.
®
XMEGA
®
devices use the 8/16-bit AVR CPU. The main function of the CPU is
29.
”Interrupts and Programmable Multilevel
XMEGA B3
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