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ATXMEGA192A3U-MH

8/16-bit Atmel XMEGA A3U Microcontroller

Atmel Corporation 

XMEGA A3U

7.3 Flash Program Memory

The Atmel® AVR® XMEGA® devices contain On-chip In-System Reprogrammable Flash mem-

ory for program storage. The Flash memory can be accessed for read and write both from an

external programmer through the PDI, or from application software running in the device.

All AVR instructions are 16- or 32-bit wide, each Flash address location is 16-bit.

The Flash memory is organized in two main sections, the Application Section and the Boot

Loader section. The size 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, 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 Non-volatile data in the Program Memory.

Figure 7-1.

Flash Program Memory (Hexadecimal address)

Word Address

0

Application Section

(256K/192K/128K/64K)

...

1EFFF / 16FFF /

1F000 / 17000 /

1FFFF / 17FFF /

EFFF / 77FF

F000 / 7800

FFFF / 7FFF

Application Table Section

(8K/8K/8K/4K)

20000 / 18000 / 10000 / 8000

20FFF / 18FFF / 10FFF / 87FF

Boot Section

(8K/8K/8K/4K)

The Application Table Section and Boot Section can also be used for general application

software.

10

8386A–AVR–07/11

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