ATxmega32A4-CU datasheet(13/104 Pages) ATMEL

13 / 104 page

8069L–AVR–11/09

XMEGA A4

7.4.3

EEPROM Data Memory

The XMEGA A4 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 A4 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.

Device

Device ID bytes

Byte 2

Byte 1

Byte 0

ATxmega16A4

ATxmega32A4

ATxmega64A4

ATxmega128A4

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