Microprocessor Based Design: Chapter 7 Branch and Control Instructions

What is the primary function of branch instructions in a program?

To interface with external devices
To store data in memory
To perform arithmetic operations
To control the flow of program execution (correct)

What occurs when an unconditional branch is executed?

The program terminates
The program returns to the next instruction
The program executes a specific function
The program executes a specific code segment (correct)

What is the purpose of a function call in a program?

To execute a specific code segment
To return to the next instruction
To terminate the program
To execute a specific code implemented by the function (correct)

What happens when a return from a function call is executed?

The program returns to the next instruction following the instruction that called the function (B) Signup and view all the answers

What is the effect of an interrupt on normal program execution?

The program suspends and executes an interrupt service routine (A) Signup and view all the answers

What happens when a return from an interrupt service routine is executed?

The program returns to the instruction where the program execution was before the interrupt (C) Signup and view all the answers

What usually causes a bus fault and stops normal execution?

A hardware or software error or bug (B) Signup and view all the answers

What do system exceptions and software interrupts use?

Branch and control instructions (B) Signup and view all the answers

What does the condition code table provide?

The condition code (B) Signup and view all the answers

What is the purpose of setting bit 0 of the address in register Rm to 1?

To indicate the code execution is in Thumb mode (D) Signup and view all the answers

What happens if bit 0 of Rm is set to 0 in BX and BLX instructions?

A usage fault exception occurs (D) Signup and view all the answers

What is the exception rule for BX and BLX instructions?

They can access both lower and higher registers (D) Signup and view all the answers

What is the purpose of the BX LR instruction in the function 'addition'?

To return from the function 'addition' (C) Signup and view all the answers

Which instruction is used to call the function 'addition' for the second time?

BLX R3 (A) Signup and view all the answers

What is the purpose of the stack in implementing nested function calls?

To store the return address of the function (B) Signup and view all the answers

What is the operation performed by the ADD instruction in the function 'addition'?

Addition (D) Signup and view all the answers

What is the instruction used to call the function 'addition' for the first time?

BL addition (C) Signup and view all the answers

Which register is used to store the result of the function 'addition'?

R2 (A) Signup and view all the answers

What is the purpose of the EQ condition code in Thumb2 instruction set?

To check equality (A) Signup and view all the answers

What is the purpose of the unsigned conditional branch instructions?

To control the flow of the program (D) Signup and view all the answers

What is the function of the BNE instruction in the given assembly program?

To jump to the loop label if the value in R3 is not zero (C) Signup and view all the answers

What is the initial value of the variable x in the given scenario?

10 (B) Signup and view all the answers

Which flags are used in signed conditional branch instructions?

Negative, overflow, and zero flags (D) Signup and view all the answers

What is the purpose of the code fragment given?

To calculate the parity of a variable (C) Signup and view all the answers

What is the purpose of the BCC instruction in the context of counting the parity of a number?

To count the number of 1s in a number (B) Signup and view all the answers

What is the condition for the loop to terminate in the given scenario?

The value in R3 becomes zero (A) Signup and view all the answers

What is the purpose of the single-flag branch instructions?

To control the flow of the program based on a single condition (C) Signup and view all the answers

Why is it necessary for the variable initial value to be even for proper loop termination?

To ensure the loop terminates (D) Signup and view all the answers

What is the purpose of the if branching structure?

To test a condition and execute a set of instructions (B) Signup and view all the answers

What is implemented using the conditional and unconditional branch instructions?

Various high-level decision-making structures (C) Signup and view all the answers