ATXMEGA256A3B_09 ATMEL [ATMEL Corporation], ATXMEGA256A3B_09 Datasheet - Page 9

• Manufacturer Part Number: ATXMEGA256A3B_09
• Description: 8/16-bit XMEGA A3B Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

7. Memories
7.1
7.2
8116F–AVR–09/09
Features
Overview
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The AVR architecture has two main memory spaces, the Program Memory and the Data Mem-
ory. In addition, the XMEGA A3B 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
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.
Flash Program Memory
Data Memory
Production Signature Row Memory for factory programmed data
User Signature Row
– 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
– Built in fast CRC check of a selectable flash program memory section
– One linear address space
– Single cycle access from CPU
– SRAM
– EEPROM
– I/O Memory
– Bus arbitration
– Separate buses for SRAM, EEPROM, I/O Memory and External Memory access
Byte and page accessible
Optional memory mapping for direct load and store
Configuration and Status registers for all peripherals and modules
16 bit-accessible General Purpose Register for global variables or flags
Safe and deterministic handling of CPU and DMA Controller priority
Simultaneous bus access for CPU and DMA Controller
Device ID for each microcontroller device type
Serial number for each device
Oscillator calibration bytes
ADC, DAC and temperature sensor calibration data
One flash page in size
Can be read and written from software
Content is kept after chip erase
”Ordering Information” on page
2. In addition each device has a Flash
XMEGA A3B
9