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ATmega1284 Datasheet

8-bit Atmel Microcontroller

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7. AVR CPU Core
7.1 Overview
This section discusses the AVR core architecture in general. The main function of the CPU core is to ensure
correct program execution. The CPU must therefore be able to access memories, perform calculations, control
peripherals, and handle interrupts.
Figure 7-1. Block diagram of the AVR architecture.
Flash
Program
Memory
Instruction
Register
Instruction
Decoder
Control Lines
Program
Counter
Data Bus 8-bit
Status
and Control
32 x 8
General
Purpose
Registrers
ALU
Interrupt
Unit
SPI
Unit
Watchdog
Timer
Analog
Comparator
Data
SRAM
EEPROM
I/O Module1
I/O Module 2
I/O Module n
I/O Lines
In order to maximize performance and parallelism, 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
pipelining. While one instruction is being executed, the next instruction is pre-fetched from the program memory.
This concept enables instructions to be executed in every clock cycle. The program memory is In-System
Reprogrammable Flash memory.
The fast-access Register File contains 32 x 8-bit general purpose working registers with a single clock cycle
access time. This allows single-cycle Arithmetic Logic Unit (ALU) operation. In a typical ALU operation, two
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P [DATASHEET]
Atmel-8272G-AVR-01/2015
10
ATMEL Corporation
ATMEL Corporation



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