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| 型號： | R83C154DTXXX-25D |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44 |
| 封裝： | LCC-44 |
| 文件頁數(shù)： | 87/108頁 |
| 文件大小： | 3682K |
| 代理商： | R83C154DTXXX-25D |
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8
8069R–AVR–06/2013
XMEGA A4
Not recommended for new designs -
Use XMEGA A4U series
6.
AVR CPU
6.1
Features
8/16-bit high performance AVR RISC Architecture
– 138 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 16M Bytes of program and data memory
True 16/24-bit access to 16/24-bit I/O registers
Support for 8-, 16- and 32-bit Arithmetic
Configuration Change Protection of system critical features
6.2
Overview
The XMEGA A4 uses the 8/16-bit AVR CPU. The main function of the CPU is program execu-
tion. The CPU must therefore be able to access memories, perform calculations and control
peripherals. Interrupt handling is described in a separate section. Figure 6-1 on page 8 shows
the CPU block diagram.
Figure 6-1.
CPU block diagram
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 pipeline. While one
instruction is being executed, the next instruction is pre-fetched from the program memory. This
Flash
Program
Memory
Instruction
Decode
Program
Counter
OCD
32 x 8 General
Purpose
Registers
ALU
Multiplier/
DES
Instruction
Register
STATUS/
CONTROL
Peripheral
Module 1
Peripheral
Module 2
EEPROM
PMIC
SRAM
DATA BUS
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