ATXMEGA128D4 Datasheet, PDF (10/100 Pages) ATMEL Corporation – 8/16-bit AVR XMEGA D4 Microcontroller

XMEGA D4
7. Memories
7.1 Features
7.2 Overview
• Flash Program Memory
– One linear address space
– In-System Programmable
– Self-Programming and Bootloader support
– Application Section for application code
– Application Table Section for application code or data storage
– Boot Section for application code or bootloader code
– Separate lock bits and protection for all sections
• 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
Four bit-accessible General Purpose Register for global variables or flags
• Production Signature Row Memory for factory programmed data
Device ID for each microcontroller device type
Serial number for each device
Oscillator calibration bytes
ADC and temperature sensor calibration data
• User Signature Row
One flash page in size
Can be read and written from software
Content is kept after chip erase
The AVR architecture has two main memory spaces, the Program Memory and the Data Mem-
ory. In addition, the XMEGA D4 features an EEPROM Memory for non-volatile data storage. All
three memory spaces are linear and require no paging. The available memory size configura-
tions 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.
Non-volatile memory spaces can be locked for further write or read/write operations. This pre-
vents unrestricted access to the application software.
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