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ATMEGA325V-8AJ Datasheet(PDF) 9 Page - ATMEL Corporation |
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ATMEGA325V-8AJ Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 347 page  9 ATmega325/3250/645/6450 2570A–AVR–09/04 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 4. 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 exe- cuted, 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 operands are output from the Register File, 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 |
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