Practice Program 3: Read Switch Inputs And Display On Port C Lower (5.3) - Parallel I/O Interfacing with 8085 (8255 Programmable Peripheral Interface)
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Program 3: Read Switch Inputs and Display on Port C Lower

Practice - Program 3: Read Switch Inputs and Display on Port C Lower

Learning

Practice Questions

Test your understanding with targeted questions

Question 1 Easy

What is the purpose of the Control Word in the 8255?

💡 Hint: Think about what setups you need for input and output.

Question 2 Easy

State the hexadecimal representation of the control word for Reading Switch Inputs.

💡 Hint: Convert the binary value to hex after understanding its bits.

4 more questions available

Interactive Quizzes

Quick quizzes to reinforce your learning

Question 1

What does the Control Word 9AH configure?

Port A as Output
Port B as Output
Port B as Input
Port C Lower as Output
Port A as Input
Port C Upper as Output

💡 Hint: Recall the binary representation of the control word.

Question 2

True or False: The accumulator holds data before issuing commands to output to peripheral devices.

True
False

💡 Hint: Reflect on the role of the accumulator in assembly programming.

1 more question available

Challenge Problems

Push your limits with advanced challenges

Challenge 1 Hard

How would you modify the program to handle 8 switches instead of 4? Specify the required changes in the control word and code.

💡 Hint: Think about how to extend the current setup to accommodate the additional switches.

Challenge 2 Hard

What would happen if you connected more than 4 LEDs to Port C? Discuss how this could impact the readings and functionality.

💡 Hint: Consider the input and output structure and why it is pre-defined.

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Reference links

Supplementary resources to enhance your learning experience.