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ATMEGA8515-16JC Datasheet(PDF) 10 Page - ATMEL Corporation |
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ATMEGA8515-16JC Datasheet(HTML) 10 Page - ATMEL Corporation |
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10 / 254 page  10 ATmega8515(L) 2512G–AVR–03/05 General Purpose Register File The Register File is optimized for the AVR Enhanced RISC instruction set. In order to achieve the required performance and flexibility, the following input/output schemes are supported by the Register File: • One 8-bit output operand and one 8-bit result input • Two 8-bit output operands and one 8-bit result input • Two 8-bit output operands and one 16-bit result input • One 16-bit output operand and one 16-bit result input Figure 4 shows the structure of the 32 general purpose working registers in the CPU. 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 phys- ically implemented 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. 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 |
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