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Embedded System.. 1. Analyze the instruction sets below. LDR R1, [R0, #0x08] SUB R1, R1, R2,...

Embedded System..


1. Analyze the instruction sets below.

LDR R1, [R0, #0x08]

SUB R1, R1, R2, LSR R3

LDR R1,[R0,R2,LSL#2]!

LDR R1, [R0],R2, LSL #1

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Answer #1

Memory: Think of as single one-dimensional array where each cell v Stores a byte size value v Is referred to by a 32 bit address e.g. value at 0x4000 is 0x0a vData is stored in memory as: variables, arrays, structures vBut ARM arithmetic instructions only operate on registers, never directly on memory. vData transfer instructions transfer data between registers and memory: vMemory to register or LOAD from memory to register vRegister to memory or STORE from register to memory

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