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| 型號(hào)： | MR80C52EXXX-16SHXXX:R |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44 |
| 封裝： | LCC-44 |
| 文件頁(yè)數(shù)： | 111/143頁(yè) |
| 文件大?。?/td> | 4602K |
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7
XMEGA A3BU [DATASHEET]
8362F–AVR–02/2013
6.
AVR CPU
6.1
Features
8/16-bit, high-performance Atmel AVR RISC CPU
142 instructions
Hardware multiplier
32x8-bit registers directly connected to the ALU
Stack in RAM
Stack pointer accessible in I/O memory space
Direct addressing of up to 16MB of program memory and 16MB of data memory
True 16/24-bit access to 16/24-bit I/O registers
Efficient support for 8-, 16-, and 32-bit arithmetic
Configuration change protection of system-critical features
6.2
Overview
All Atmel AVR XMEGA devices use the 8/16-bit AVR CPU. The main function of the CPU is to execute the code and
perform all calculations. The CPU is able to access memories, perform calculations, control peripherals, and execute the
program in the flash memory. Interrupt handling is described in a separate section, refer to “Interrupts and Programmable
6.3
Architectural Overview
In order to maximize performance and parallelism, the AVR CPU uses a Harvard architecture with separate memories
and buses for program and data. Instructions in the program memory are executed with single-level pipelining. While one
instruction is being executed, the next instruction is pre-fetched from the program memory. This enables instructions to
be executed on every clock cycle. For details of all AVR instructions, refer to http://www.atmel.com/avr.
Figure 6-1.
Block diagram of the AVR CPU architecture.
Register File
Flash Program
Memory
Program
Counter
Instruction
Register
Instruction
Decode
Data Memory
ALU
Status
Register
R0
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26 (XL)
R27 (XH)
R28 (YL)
R29 (YH)
R30 (ZL)
R31 (ZH)
Stack
Pointer
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