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ATXMEGA128A3U-AU Datasheet(PDF) 10 Page - ATMEL Corporation |
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ATXMEGA128A3U-AU Datasheet(HTML) 10 Page - ATMEL Corporation |
10 / 116 page 10 8386A–AVR–07/11 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. The Application Table Section and Boot Section can also be used for general application software. Figure 7-1. Flash Program Memory (Hexadecimal address) Word Address 0 Application Section (256K/192K/128K/64K) ... 1EFFF / 16FFF / EFFF / 77FF 1F000 / 17000 / F000 / 7800 Application Table Section (8K/8K/8K/4K) 1FFFF / 17FFF / FFFF / 7FFF 20000 / 18000 / 10000 / 8000 Boot Section (8K/8K/8K/4K) 20FFF / 18FFF / 10FFF / 87FF |
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