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ATmega128-16AU Datenblatt(PDF) 13 Page - ATMEL Corporation |
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ATmega128-16AU Datenblatt(HTML) 13 Page - ATMEL Corporation |
13 / 386 page 13 2467S–AVR–07/09 ATmega128 Figure 4. AVR CPU General Purpose Working Registers Most of the instructions operating on the Register file have direct access to all registers, and most of them are single cycle instructions. As shown in Figure 4, each register is also assigned a data memory address, mapping them directly into the first 32 locations of the user Data Space. Although not being physically imple- mented as SRAM locations, this memory organization provides great flexibility in access of the registers, as the X-, Y-, and Z-pointer Registers can be set to index any register in the file. X-register, Y-register, and Z-register The registers R26..R31 have some added functions to their general purpose usage. These reg- isters are 16-bit address pointers for indirect addressing of the Data Space. The three indirect address registers X, Y, and Z are described in Figure 5. Figure 5. The X-, Y-, and Z-registers In the different addressing modes these address registers have functions as fixed displacement, automatic increment, and automatic decrement (see the Instruction Set Reference for details). 7 0 Addr. R0 $00 R1 $01 R2 $02 … R13 $0D General R14 $0E Purpose R15 $0F Working R16 $10 Registers R17 $11 … R26 $1A X-register Low Byte R27 $1B X-register High Byte R28 $1C Y-register Low Byte R29 $1D Y-register High Byte R30 $1E Z-register Low Byte R31 $1F Z-register High Byte 15 XH XL 0 X - register 7 0 7 0 R27 ($1B) R26 ($1A) 15 YH YL 0 Y - register 7 0 7 0 R29 ($1D) R28 ($1C) 15 ZH ZL 0 Z - register 7 0 7 0 R31 ($1F) R30 ($1E) |
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