Arm addressing modes pdf

# Arm addressing modes pdf
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Most processors support several of these addressing modesAddressing modes. Zero offset [Rn] Equivalent to [Rn,#0] nT, nJ T or J variants of ARM architecture version n and above When accessing an operand for a data processing or movement instruction, there are several standard techniques used to specify the desired location. Instruction Set. Addressing ModeWord and Unsigned Byte Data Transfer ARM architecture versions. Immediate addressing: the desired value is presented as a binary value in the instruction. Immediate addressing: the desired value is presented as a binary value in the instruction Memory Addressing Modes ¾Pre-indexed mode The effective address of the operand is the sum of the contents of the base register Rn and an offset value ¾Pre-indexed with writeback mode The effective address of the operand is generated in the same way as in the Pre-indexed mode, and then the effective address is written back into Rn Pre-indexed Immediate offset [Rn,+/-]{!} n ARM architecture version n and above. Two basic classificationBase register Addressing Register holds thebit memory address Also called the base addressBase Displacement Addressing mode An effective address is calculated ARM Addressing Modes Quick Reference Card Operation § Assembler Action Notes Load Word LDR{cond} Rd, Rd:= [address] Rd must not be R User mode privilege LDR{cond}T Rd, Rd must not be R branch (§ 5T: and exchange) LDR{cond} R15, R= [address][] (§ 5T: Change to Thumb if [address][0] is 1) ARM® Instruction Set Quick Reference Card. ARM Addressing Modes Quick Reference Card Operation § Assembler Action Notes Load Word LDR{cond} Rd, Rd:= [address] Rd must not be R User mode -simple addressing mode Other ARM architecture features -Arithmetic Logic Unit and barrel shifter -auto increment and rement addressing mode -conditional execution Memory Addressing Modes ¾Pre-indexed mode The effective address of the operand is the sum of the contents of the base register Rn and an offset value ¾Pre-indexed with Addressing modes. Absolute addressing: the instruction contains the full binary ARM Addressing Mode † The ARM processor support ARM offers several addressing modes and they are pre-indexed, pre-indexed with immediate offset, pre Addressing Modes! There are many ways in ARM to specify the address; these are called addressing modes.!