ARM Assembly Quiz - Memory Operations: LDR and STR

What does LDR stand for?

• Load Register

• Local Data Register

• Load Data RAM

• Logical Data Read

What does STR do?

• Stores memory into register

• Copies memory to memory

• Stores register value into memory

• Moves register to register

Which instruction loads the value stored at memory address 120 into R0?

• ADD R0,120

• LDR R0,120

• MOV R0,#120

• STR R0,120

Why must LDR/STR addresses be divisible by 4?

• Registers store 4 bits

• Memory is word aligned

• CPU requires multiples of 2

• Assembly syntax rule

Which instruction loads a single byte instead of a full word?

• LDR

• LDRB

• STR

• MOV

What does the instruction 'LDR R0, [R1]' mean?

• Load the value at the memory address stored in R1 into R0

• Move R0 into R1

• Jump to R1

• Load R1 into R0

Which register tracks the address of the next instruction to execute in ARM?

• APSR application status register

• R7 general-purpose register

• R0 general-purpose register

• PC program counter register

In ARM assembly, what does the instruction 'B Loop' accomplish when 'Loop' is a label in the program?

• Compares and sets condition flags

• Stores a value to memory

• Unconditionally jumps to label Loop

• Terminates the current program

Which instruction updates condition flags by comparing two operands without storing a result?

• TEST logical test operation

• CMP compare instruction

• CHECK pseudo compare macro

• EQU symbol definition directive

Which flag indicates that the result of a comparison is zero?

• N

• V

• Z

• C