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ATxmega16A4-MH Datasheet(PDF) 11 Page - ATMEL Corporation |
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ATxmega16A4-MH Datasheet(HTML) 11 Page - ATMEL Corporation |
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11 / 107 page  11 8069O–AVR–08/10 XMEGA A4 7.3 In-System Programmable Flash Program Memory The XMEGA A4 devices contain On-chip In-System Programmable Flash memory for program storage, see Figure 7-1 on page 11. Since all AVR instructions are 16- or 32-bits wide, each Flash address location is 16 bits. The Program Flash memory space is divided into Application and Boot sections. Both sections have dedicated Lock Bits for setting restrictions on write or read/write operations. The Store Pro- gram Memory (SPM) instruction must reside in the Boot Section when used to write to the Flash memory. A third section inside the Application section is referred to as the Application Table section which has separate Lock bits for storage of write or read/write protection. The Application Table sec- tion can be used for storing non-volatile data or application software. 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 (128 KB/64 KB/32 KB/16 KB) ... EFFF / 77FF / 37FF / 17FF F000 / 7800 / 3800 / 1800 Application Table Section (4 KB/4 KB/4 KB/4 KB) FFFF / 7FFF / 3FFF / 1FFF 10000 / 8000 / 4000 / 2000 Boot Section (8 KB/4 KB/4 KB/4 KB) 10FFF / 87FF / 47FF / 27FF |
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