CMPEN 472, The Pennsylvania State University
Homework 5
Due: Feb. 21, 2025 11:30pm
Objective
To learn how to use serial port for cummunications, how to write subroutines, how to construct LOOPs,
and how to do user interaction.
Note on board names
CSM12C128 board is also called HCS12C128 board or APS12C128 board. It contains the
MC9S12C128 microcontroller chip. In the previous years, the class used smaller CSM12C32 boards
with MC9S12C32 microcontroller chip. The main differences are the on-chip RAM size and flash
memory size. The RAM on MC9S12C128 chip starts at $3000 and the RAM on MC9S12C32 chip
starts at $3800. Otherwise, both chips are practically the same.
This Semester, we are using ONLY the CodeWarrior Debugger/Simulator to show the hardware and
program workings. For the grading of all homework during this Semester, we will be testing your
program on the CodeWarrior simulator only.
Instruction
1. Read the HCS12 Microcontroller reference manual, S12CPUV2 and data sheet Chapters 1, 2,
and 13 of MC9S12C Family.
2. Copy the Homework 5 Sample program HW5start.asm file. Study it, assemble it, debug it, and
run it on the CodeWarrior Debugger/Simulator.
3. For the CodeWarrior simulation, please follow the Full Chip Simulator/Debugger - Homework
5 Sample program guide, with Terminal component. The sample program is the 'Type writer' -
what you type is what you see (on the Terminal component).
4. Write the user friendly, menu driven, and fool-proofed program, 'main.asm', to turn on/off LEDs
and dimm the LED lights on CSM12C128 board as follows:
Print the following menu on the Hyper Terminal:
L1: Turn on LED1
F1: Turn off LED1
L2: Turn on LED2
F2: Turn off LED2
2025/2/17 01:43CMPEN 472 Homework 5, The Pennsylvania State University
https://www.cse.psu.edu/~kxc104/class/cmpen472/25s/hw/hw5/hw5.html1/2
L3: Turn on LED3
F3: Turn off LED3
L4: LED4 goes from 0% light level to 100% light level in 0.4 seconds
F4: LED4 goes from 100% light level to 0% light level in 0.4 seconds
QUIT: Quit menu program, run 'Type writer' program.
5. When user type in the menu selection followed by a 'Return/Enter' key, your program controls
the LED lights accordingly. And you will be able to see the effects on the CodeWarrior
Debugger/Simulator.
6. Your program MUST turn on/off individual LED lights, independent of the other LED lights. If you
turn on LED1 followed by LED2, both LED1 and LED2 must be on. Please see the sample
program for Homework 2 - for an example of how to turn on/off LED1 only.
7. Print on the terminal screen the detailed instruction of how users must properly use your
program. Once your program is running, everything must be self explanatory to user at the
Terminal component attached to SCI Port. (use Hyper Terminal connected on CSM12C128
board if usng the MC9S12C128 microcontroller chip.).
8. Also, make your program 'fool-proof', never crash or stop based on wrong user response.
9. Design the program to start at $3100 and data to start at $3000.
10. If you are not sure how to start, please take a look at an example hw5 flow chart. You should
build up your program step by step.
11. Be sure to put much comments so that grader and others can clearly and quickly understand
your program. Comments are very important in assembly language programs.
12. You may want to see and check the Sample Grading Sheet for this homework.
13. Copy your 'main.asm' file to 'cmpen472hw5_YourLastName.asm'. For example, mine will be
'cmpen472hw5_choi.asm' Do not ZIP your 'cmpen472hw5_YourLastName.asm' file.
14. Turn-in your project source code file through Penn State CANVAS. Upload your source code file
into the CANVAS Assignment's Homework submission. Be sure to select CMPEN 472 class and
correct Homework number, and correct file name.
Congratulations on your fifth CMPEN 472 homework completion!
Epilogue:
Flow chart of the Homework 5 program. Click here.
Aid for the Homework 5. Click here.
2025/2/17 01:43CMPEN 472 Homework 5, The Pennsylvania State University
https://www.cse.psu.edu/~kxc104/class/cmpen472/25s/hw/hw5/hw5.html2/2
