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ATMEGA128A 데이터시트(PDF) 10 Page - ATMEL Corporation |
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ATMEGA128A 데이터시트(HTML) 10 Page - ATMEL Corporation |
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10 / 369 page  10 ATmega 128A [DATASHEET] Atmel-8151I-8-bit-AVR-ATmega128A_Datasheet-08/2014 6. AVR CPU Core 6.1 Introduction This section discusses the Atmel®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. 6.2 Architectural Overview 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. 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 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 can also be used as an address pointer for look up tables in Flash Program memory. These added function registers are the 16-bit X-register, Y- register and Z-register, described later in this section. 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 |
유사한 부품 번호 - ATMEGA128A_14 |
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유사한 설명 - ATMEGA128A_14 |
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