Embedded Systems: Program Counter in Robotics
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Questions and Answers

What is the purpose of the SP (Stack Pointer) register?

  • To manage memory allocation
  • To perform arithmetic operations
  • To access the stack in RAM (correct)
  • To store user inputs

In the context of a CPU, what operation is performed when a register's content is stored in the stack?

  • COMPARE operation
  • ADD operation
  • PUSH operation (correct)
  • POP operation

What happens when an endless loop occurs in a computer program?

  • The program freezes and becomes unresponsive (correct)
  • The program speeds up execution
  • The program skips to the next instruction
  • The program exits gracefully

What type of applications typically idle through an Infinite Loop?

<p>Embedded systems (D)</p> Signup and view all the answers

What can cause an older operating system to become unresponsive?

<p>Infinite loop consuming all available processor time (D)</p> Signup and view all the answers

How is a register retrieved from the stack?

<p>POP operation (A)</p> Signup and view all the answers

What does the Program Counter in embedded systems contain?

<p>The address of the next instruction to be executed (A)</p> Signup and view all the answers

What happens to the Program Counter during branch and jump operations?

<p>It is loaded with an address other than the next sequential location (C)</p> Signup and view all the answers

What is the significance of the reset vector in embedded systems?

<p>Points the processor to the memory address with the firmware's first instruction (B)</p> Signup and view all the answers

What happens if developers do not program the reset vector in the final image?

<p>The processor will not start up on the final product (A)</p> Signup and view all the answers

What is the purpose of activating a power-on reset in embedded systems?

<p>Resetting all values in the Program Counter (A)</p> Signup and view all the answers

Where does the CPU expect to find the first instruction upon reset?

<p>$0000 in ROM memory location (D)</p> Signup and view all the answers

What instructs the program that an event has occurred?

<p>Interrupts (B)</p> Signup and view all the answers

Which type of machine stores the most significant byte of data in the lowest memory address?

<p>Big-Endian (B)</p> Signup and view all the answers

What is the consequence of spending too much time servicing an interrupt?

<p>Miss another interrupt (D)</p> Signup and view all the answers

How do Little-Endian machines store data in memory?

<p>Least significant byte in the lowest memory address (C)</p> Signup and view all the answers

What type of mechanism are interrupts considered to be?

<p>Hardware (D)</p> Signup and view all the answers

In which situation may a processor come out of a sleep mode?

<p>Upon a timer or an External Interrupt (C)</p> Signup and view all the answers

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