ATXMEGA32A4(2008) Просмотр технического описания (PDF) - Atmel Corporation
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ATXMEGA32A4 Datasheet PDF : 74 Pages
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XMEGA A4
7.4.2 SRAM Data Memory
7.4.3
The XMEGA A4 devices has internal SRAM memory for data storage.
EEPROM Data Memory
The XMEGA A4 devices has 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 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 A1 devices is
shown in Table 7-1 on page 11. 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 A4 devices.
Device
ATxmega16A4
ATxmega32A4
ATxmega64A4
ATxmega128A4
Byte 2
41
41
46
46
Device ID bytes
Byte 1
94
85
96
97
Byte 0
1E
1E
1E
1E
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.
11
8069D–AVR–08/08
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