ATXMEGA128D4 datasheet(13/100 Pages) ATMEL

13 / 100 page

8135G–AVR–08/10

XMEGA D4

7.4.3

EEPROM Data Memory

The XMEGA D4 devices have internal EEPROM memory for non-volatile data storage. It is

addressable either in a separate data space or it can be memory mapped into the normal data

memory space. The EEPROM memory supports both byte and page access.

7.5

Production Signature Row

The Production Signature Row is a separate memory section for factory programmed data. It

contains calibration data for functions such as oscillators and analog modules.

The production signature row also contains a device ID that identify each microcontroller device

type, and a serial number that is unique for each manufactured device. The device ID for the

available XMEGA A4 devices is shown in Table 7-1 on page 13. The serial number consist of

the production LOT number, wafer number, and wafer coordinates for the device.

The production signature row can not be written or erased, but it can be read from both applica-

tion software and external programming.

Table 7-1.

Device ID bytes for XMEGA D4 devices.

7.6

User Signature Row

The User Signature Row is a separate memory section that is fully accessible (read and write)

from application software and external programming. The user signature row is one flash page

in size, and is meant for static user parameter storage, such as calibration data, custom serial

numbers or identification numbers, random number seeds etc. This section is not erased by

Chip Erase commands that erase the Flash, and requires a dedicated erase command. This

ensures parameter storage during multiple program/erase session and on-chip debug sessions.

7.7

Flash and EEPROM Page Size

The Flash Program Memory and EEPROM data memory are organized in pages. The pages are

word accessible for the Flash and byte accessible for the EEPROM.

Table 7-2 on page 14 shows the Flash Program Memory organization. Flash write and erase

operations are performed on one page at the time, while reading the Flash is done one byte at

the time. For Flash access the Z-pointer (Z[m:n]) is used for addressing. The most significant

bits in the address (FPAGE) give the page number and the least significant address bits

(FWORD) give the word in the page.

Device

Device ID bytes

Byte 2

Byte 1

Byte 0

ATxmega16D4

ATxmega32D4

ATxmega64D4

ATxmega128D4

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