ATXMEGA8E5_14 datasheet(12/147 Pages) ATMEL

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XMEGA E5 [DATASHEET]

Atmel-8153I–AVR-ATxmega8E5-ATxmega16E5-ATxmega32E5_Datasheet–08/2014

8.3

Flash Program Memory

The Atmel® AVR® XMEGA® devices contain on-chip, in-system reprogrammable flash memory for program storage. The

flash memory can be accessed for read and write from an external programmer through the PDI or from application

software running in the device.

All AVR CPU instructions are 16 or 32 bits wide, and each flash location is 16 bits wide. The flash memory is organized

in two main sections, the application section and the boot loader section. The sizes of the different sections are fixed, but

device-dependent. These two sections have separate lock bits, and can have different levels of protection. The store

program memory (SPM) instruction, which is used to write to the flash from the application software, will only operate

when executed from the boot loader section.

The application section contains an application table section with separate lock settings. This enables safe storage of

nonvolatile data in the program memory.

Figure 8-1.

Flash Program Memory (Hexadecimal address).

8.3.1

Application Section

The Application section is the section of the flash that is used for storing the executable application code. The protection

level for the application section can be selected by the boot lock bits for this section. The application section can not store

any boot loader code since the SPM instruction cannot be executed from the application section.

8.3.2

Application Table Section

The application table section is a part of the application section of the flash memory that can be used for storing data.

The size is identical to the boot loader section. The protection level for the application table section can be selected by

the boot lock bits for this section. The possibilities for different protection levels on the application section and the

application table section enable safe parameter storage in the program memory. If this section is not used for data,

application code can reside here.

8.3.3

Boot Loader Section

While the application section is used for storing the application code, the boot loader software must be located in the boot

loader section because the SPM instruction can only initiate programming when executing from this section. When

programming, the CPU is halted, waiting for the flash operation to complete. The SPM instruction can access the entire

flash, including the boot loader section itself. The protection level for the boot loader section can be selected by the boot

loader lock bits. If this section is not used for boot loader software, application code can be stored here.

Word Address

ATxmega32E5

ATxmega16E5

ATxmega8E5

Application Section

(32K/16K/8K)

...

37FF

17FF

BFF

3800

1800

C00

Application Table Section

(4K/4K/2K)

3FFF

1FFF

FFF

4000

2000

1000

Boot Section

(4K/4K/2K)

47FF

27FF

13FF

ATXMEGA8E5 Datasheet(PDF) 12 Page - ATMEL Corporation

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