ARM Instruction Formats and Addressing Modes

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Which component is responsible for transferring operands to the ALU for arithmetic and logical instructions?

Instruction Register (IR)

Memory Address Register (MAR)

Program Counter (PC)

Control Unit (correct)

In the instruction format LDR registerdestination, memorysource, what does 'LDR' stand for?

Load Register

Load Direct Register

Loading Data Register

Load Data to Register (correct)

When performing an LDR operation, what is the direction of data transfer?

Register → ALU

ALU → Register

Memory → Register (correct)

Register → Memory

What happens after an instruction is decoded in the execution process for arithmetic and logical operations?

The operands are transferred to the ALU where they are operated on. Signup and view all the answers

In the context of instruction processing, what does the Program Counter (PC) indicate?

The next instruction to be fetched. Signup and view all the answers

Which addressing mode allows register indirect addressing with displacement in ARM architecture?

Register indirect addressing Signup and view all the answers

What is the main advantage of accessing registers over memory locations in ARM architecture?

Registers require fewer bits for address encoding Signup and view all the answers

In ARM assembly language, what operation copies the content of a memory location into a register?

LDR Signup and view all the answers

Which type of computer architecture does ARM follow?

Reduced Instruction Set Computer (RISC) Signup and view all the answers

In RISC architecture, what is the main advantage of having fixed instruction sizes?

Simpler instruction decoding Signup and view all the answers

In a stored program machine, which unit is responsible for handling the transfer of data between the computer and external devices?

Input/Output (I/O) unit Signup and view all the answers

What does a memory unit in a computer system store?

Programs and data can be stored together or separately Signup and view all the answers

How are memory locations identified in a computer system?

By unique addresses Signup and view all the answers

Which factor determines the number of memory locations that can be addressed in a computer system?

Number of address bits Signup and view all the answers

What is the main function of the Input/Output (I/O) unit in a computer system?

Handle data transfer between the computer and external devices Signup and view all the answers

What is the purpose of appending an 'S' to an instruction in ARM programming?

To specify that the instruction updates the status flags in CPSR Signup and view all the answers

In ARM programming, what does BEQ onZero do?

Forces a branch to a specified line if the last operation resulted in zero Signup and view all the answers

Why might dividing a 16-bit addition into two 8-bit additions yield an incorrect result?

There might be carry issues in adding the least significant byte Signup and view all the answers

What happens if Z = 0 in CPSR during the execution of the onZero instruction?

[PC] remains unchanged and the notZero instruction is executed Signup and view all the answers

Why are registers needed in CPU despite having memory locations?

Registers allow faster access for arithmetic operations compared to memory locations Signup and view all the answers

What does a literal operand in ARM assembly language look like?

Prefixed by a hash symbol (#) Signup and view all the answers

When executing LDR r1, #25 instruction, where is the value 25 being loaded from?

Operand field of the IR Signup and view all the answers

What is the purpose of the CPSR in ARM architecture?

To store the status of operations performed Signup and view all the answers

In ARM assembly language, how are branching decisions made based on flags?

Based on flags in the CPSR Signup and view all the answers

What does the instruction BEQ allow a processor to do?

Continue program execution normally or execute a branch based on a condition Signup and view all the answers