What This Document Is
This is a pre-laboratory assignment designed to prepare students for hands-on work in an introductory microprocessor course (ECE 2510) at Western Michigan University. Specifically, this “Fourth Prelab” focuses on the principles and practical considerations of interfacing microprocessors with external hardware components – a core skill in embedded systems design. It delves into the world of parallel ports and the challenges of ensuring reliable communication between a microprocessor and the devices it controls. The material builds upon earlier concepts covered in Chapter 7 of the course.
Why This Document Matters
This resource is crucial for students enrolled in ECE 2510 who are preparing for a laboratory session involving digital input/output operations. It’s particularly beneficial for those who want to solidify their understanding *before* entering the lab, maximizing their time and improving their experimental results. Students struggling with timing issues in digital circuits, or those needing a refresher on interfacing techniques, will find this especially helpful. Successfully navigating this prelab will contribute to a stronger grasp of fundamental microprocessor concepts and practical application.
Common Limitations or Challenges
This prelab does not provide complete, ready-to-implement code solutions or detailed step-by-step lab procedures. It focuses on the *theoretical* underpinnings and design considerations necessary for successful interfacing. It assumes a basic understanding of digital logic, flip-flops, and latching mechanisms. It also doesn’t cover advanced troubleshooting techniques or delve into the specifics of programming the HCS12 microprocessor itself – those topics are addressed elsewhere in the course.
What This Document Provides
* An overview of timing compatibility considerations when connecting a microprocessor to external devices.
* Discussion of setup and hold time requirements for flip-flops and latches.
* An exploration of different methods for interfacing with common output devices like LEDs.
* Guidance on current limiting resistor selection for LED circuits.
* An introduction to the use of buffer chips when interfacing with more complex displays.
* Information regarding specific component recommendations for lab exercises (e.g., buffer chips).
* Key data sheet values for common display components.
