ATXMEGA384C3(2012) データシートの表示（PDF） - Atmel Corporation

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ATXMEGA384C3
(Rev.:2012)

8/16-bit Atmel XMEGA C3 Microcontroller

Atmel Corporation 

7. Memories

7.1 Features

• Flash program memory

– One linear address space

– In-system programmable

– Self-programming and boot loader support

– Application section for application code

– Application table section for application code or data storage

– Boot section for application code or boot loader code

– Separate read/write protection lock bits for all sections

– Built in fast CRC check of a selectable flash program memory section

• Data memory

– One linear address space

– Single-cycle access from CPU

– SRAM

– EEPROM

Byte and page accessible

Optional memory mapping for direct load and store

– I/O memory

Configuration and status registers for all peripherals and modules

4 bit-accessible general purpose registers for global variables or flags

– Bus arbitration

Deterministic priority handling between CPU, DMA controller, and other bus masters

– Separate buses for SRAM, EEPROM and I/O memory

Simultaneous bus access for CPU and DMA controller

• Production signature row memory for factory programmed data

– ID for each microcontroller device type

– Serial number for each device

– Calibration bytes for factory calibrated peripherals

• User signature row

– One flash page in size

– Can be read and written from software

– Content is kept after chip erase

7.2 Overview

The Atmel AVR architecture has two main memory spaces, the program memory and the data memory. Executable code

can reside only in the program memory, while data can be stored in the program memory and the data memory. The data

memory includes the internal SRAM, and EEPROM for nonvolatile data storage. All memory spaces are linear and

require no memory bank switching. Nonvolatile memory (NVM) spaces can be locked for further write and read/write

operations. This prevents unrestricted access to the application software.

A separate memory section contains the fuse bytes. These are used for configuring important system functions, and can

only be written by an external programmer.

The available memory size configurations are shown in “Ordering Information” on page 2. In addition, each device has a

Flash memory signature row for calibration data, device identification, serial number etc.

XMEGA C3 [DATASHEET] 11

8361C–AVR–4/12

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