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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATMEGA640 датащи(PDF) 11 Page - Microchip Technology |
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ATMEGA640 датащи(HTML) 11 Page - Microchip Technology |
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11 / 436 page  11 ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET] DS40002211A 7. AVR CPU Core 7.1 Introduction This section discusses the AVR core architecture in general. The main function of the CPU core is to ensure cor- rect program execution. The CPU must therefore be able to access memories, perform calculations, control peripherals, and handle interrupts. 7.2 Architectural Overview Figure 7-1. 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. The fast-access Register File contains 32 × 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 oper- Flash Program Memory Instruction Register Instruction Decoder Program Counter Control Lines 32 x 8 General Purpose Registers 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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