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ATMEGA328P Datasheet(PDF) 9 Page - ATMEL Corporation

Part # ATMEGA328P
Description  8-bit AVR Microcontroller with 32K Bytes In-System Programmable Flash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA328P Datasheet(HTML) 9 Page - ATMEL Corporation

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ATmega328P [DATASHEET]
7810D–AVR–01/15
6.
AVR CPU Core
6.1
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 6-1.
Block Diagram of the AVR 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 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.
Status and
Control
Interrupt
Unit
32 x 8
General
Purpose
Registers
ALU
Data Bus 8-bit
Data
SRAM
SPI
Unit
Instruction
Register
Instruction
Decoder
Watchdog
Timer
Analog
Comparator
EEPROM
I/O Lines
I/O Module n
Control Lines
I/O Module 2
I/O Module 1
Program
Counter
Flash
Program
Memory


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