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ATXMEGA384A1-AU Datasheet(PDF) 11 Page - ATMEL Corporation |
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ATXMEGA384A1-AU Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 107 page 11 8067L–AVR–08/10 XMEGA A1 7.3 In-System Programmable Flash Program Memory The XMEGA A1 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. 7.4 Data Memory The Data Memory consists of the I/O Memory, EEPROM and SRAM memories, all within one linear address space, see Figure 7-2 on page 11. To simplify development, the memory map for all devices in the family is identical and with empty, reserved memory space for smaller devices. Figure 7-1. Flash Program Memory (Hexadecimal address) Word Address 0 Application Section (Bytes) (384K/256K/192K/128K/64K) ... 2EFFF / 1EFFF / 16FFF / EFFF / 77FF 2F000 / 1F000 / 17000 / F000 / 7800 Application Table Section (Bytes) (8K/8K/8K/8K/4K) 2FFFF / 1FFFF / 17FFF / FFFF / 7FFF 30000 / 20000 / 18000 / 10000 / 8000 Boot Section (Bytes) (8K/8K/8K/8K/4K) 30FFF / 20FFF / 18FFF / 10FFF / 87FF Figure 7-2. Data Memory Map (Hexadecimal address) Byte Address ATxmega192A1 Byte Address ATxmega128A1 Byte Address ATxmega64A1 0 I/O Registers (4 KB) 0 I/O Registers (4 KB) 0 I/O Registers (4 KB) FFF FFF FFF 1000 EEPROM (2 KB) 1000 EEPROM (2 KB) 1000 EEPROM (2 KB) 17FF 17FF 17FF RESERVED RESERVED RESERVED |
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