Project 3 Pre Quiz

Question 3 0.1/0.1pts What is the ASCII value of a period (') in decimal? Please review the Lecture 5 - UART in the Video Lectures section. You may also find it helpful to look up an ASCII table online.

Question 6 0.2/0.2pts Suppose $t4 contains the value, 33. Which value can $t5 contain so that $t0 has a value of 1 after the following instruction is executed? slt $to, 5t5, $t4 21

Question 9 0.1/0.1pts Suppose you want to make a nested function call (i.e. a call to a function from inside of another function) using a jal rather than a call for performance reasons. How would the push and pop pseudo-ops be proprely ordered along with the jal so that the previous return address isnit lost? push $ra jal nested_function label nop pop Sza Correct. It is important to remember that push saves a register onto the stack and pop restores a value from the top of the stack to a register. In order to preserve the return address it should be saved before jumping and restored after returning from the jump-andHlink.

Question 12 0.1/0.1pts Based on the information in the project description, if the following two lines of code are added to the skeleton code for Project 3, what will the program do? 1i sa0, 1 call project3_print The string, "Yes" will be displayed on the simulated UART's output.

Question 15 0.25/0.25 pts Which instruction would you use to write a value to an element in an array? sw

Question 18 0.1/0.1pts Which instruction would you use to interact with the UART status register?

Question 21 0.5/0.5pts | Correct Answer Please download the following attached PLP project file: Project 3 Pre Quiz Mystery Program.plp & This program has been partially converted into machine code so that its functionality cannot be easily identified by reading it. Your task is to use PLPTool's Watcher Window and CPU Memory Visualizer to see what the output of the program s for specific input. Please open the attached file in PLPTool and perform the following steps: 1. Modify the first line in the program so that the load immediate instruction sets $t0 to the value, 53 2. Enter simulation mode (the blue button with *>SIM" on it) 3. Open the watcher window (the button with a magnifying glass icon) 4. Add registers $t0 and $s2 to the watcher window 5. Run the program until $t0 is set to the value, 0 6. Open the CPU memory visualizer (from the menu bar: Simulation -> Tools -> Create a PLP CPU Memory Visualizer) 7. In the memory visualizer, set the base address to the value of $s2 seen in the watcher window and set the signed offset to 40. 8.0ne of the rows in the memory visualizer should have a green background color and a non-zero value. Convert the value seen in this green cell from hexadecimal to decimal What value does this green memory location contain in decimal? NOTE: You must convert this value from hexadecimal to decimal in order to receive credit. 105 105