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AT43USB351M Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT43USB351M Datasheet(HTML) 8 Page - ATMEL Corporation |
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8 / 101 page  8 AT43USB351M 3302E–USB–7/04 The General- purpose Register File All register operating instructions in the instruction set have direct and single cycle access to all registers. The only exception is the five constant arithmetic and logic instructions SBCI, SUBI, CPI, ANDI, and ORI between a constant and a register, and the LDI instruction for load immediate constant data. These instructions apply to the second half of the registers in the register file – R16..R31. The general SBC, SUB, CP, AND, and OR and all other operations between two registers or on a single register apply to the entire register file. As shown in Table 2, 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-registers can be set to index any register in the file. Table 2. AVR CPU General-purpose Working Register Register Address Comment R0 $00 R1 $01 R2 $02 .. R13 $0D R14 $0E R15 $0F R16 $10 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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