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ATMEGA8-16PU Folha de dados(PDF) 9 Page - ATMEL Corporation

Nome de Peças ATMEGA8-16PU
Descrição Electrónicos  8-bit with 8K Bytes In-System Programmable Flash
Download  308 Pages
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA8-16PU Folha de dados(HTML) 9 Page - ATMEL Corporation

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9
2486T–AVR–05/08
ATmega8(L)
AVR CPU Core
Introduction
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.
Architectural
Overview
Figure 2. Block Diagram of the AVR MCU Architecture
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 instruc-
tion 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 typ-
ical ALU operation, two operands are output from the Register File, the operation is executed,
and the result is stored back in the Register File – in one clock cycle.
Six of the 32 registers can be used as three 16-bit indirect address register pointers for Data
Space addressing – enabling efficient address calculations. One of the these address pointers
Flash
Program
Memory
Instruction
Register
Instruction
Decoder
Program
Counter
Control Lines
32 x 8
General
Purpose
Registrers
ALU
Status
and Control
I/O Lines
EEPROM
Data Bus 8-bit
Data
SRAM
Interrupt
Unit
SPI
Unit
Watchdog
Timer
Analog
Comparator
i/O Module 2
i/O Module1
i/O Module n


Nº de peça semelhante - ATMEGA8-16PU

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