12
8068C–AVR–06/08
XMEGA A3
7.5 Calibration Row
The Calibration Row is a separate memory section for factory programmed data. It contains cal-
ibration data for functions such as oscillators, device ID, and a factory programmed serial
number that is unique for each device. The device ID for the available XMEGA A3 devices is
shown in Table 7-1 on page 12. Some of the calibration values will be automatically loaded to
the corresponding module or peripheral unit during reset. The Calibration Row can not be written
or erased. It can be read from application software and external programming.
Table 7-1. Device ID bytes for XMEGA A3 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, random number seeds etc. This section is not erased by Chip Erase, and requires a
dedicated erase command. This ensures parameter storage during multiple program/erase ses-
sion and On-Chip Debug sessions.
Device Device ID bytes
Byte 2 Byte 1 Byte 0
ATxmega64A3 42 96 1E
ATxmega128A3 42 97 1E
ATxmega192A3 44 97 1E
ATxmega256A3 42 98 1E
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