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Write a program to count continuously in hexadecimal from FFH to 00H in a system with a 0.5 us clock period. Use register C to set up a one millisecond delay between each count and display the numbers at one of the output ports.

Write a program to count continuously in hexadecimal from FFH to 00H in a system with a 0.5 us clock period. Use register C to set up a one millisecond delay between each count and display the numbers at one of the output ports.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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**Program Design for Hexadecimal Counting** **Overview:** The task is to design a program that counts continuously in hexadecimal from FFH (255 in decimal) to 00H (0 in decimal) in a computing system with a clock period of 0.5 microseconds (µs). **Instructions:** 1. **Counting Mechanism:** - The program must initiate a counter starting at FFH and decrement it with each clock cycle until it reaches 00H. - Upon reaching 00H, the counter resets to FFH, creating a continuous loop. 2. **Timing Control:** - To ensure that the counting is perceivable, incorporate a delay of 1 millisecond (ms) between each count decrement. - This is achieved using register C to manage the timing delay by aligning it with the clock cycle. 3. **Output:** - The program should output the current count value via one of the system’s output ports for real-time monitoring. **Technical Details:** - **Clock Period:** 0.5 µs - **Required Delay:** To achieve a 1 ms delay, calculate the necessary number of clock cycles based on the clock period. - \[\text{Number of Cycles} = \frac{1 \text{ ms}}{0.5 \text{ µs}} = 2000 \text{ cycles}\] - **Implementation Steps:** - Initialize the counter at FFH. - Use register C to facilitate a loop that counts 2000 clock cycles, creating the required delay. - Decrement the hexadecimal counter. - Output the count at each step through the designated port. - Reset counter upon reaching 00H. **Use Case:** This program can be an educational exercise in embedded systems programming and understanding of microcontroller operations, especially in managing time delays and output operations.
Transcribed Image Text:**Program Design for Hexadecimal Counting** **Overview:** The task is to design a program that counts continuously in hexadecimal from FFH (255 in decimal) to 00H (0 in decimal) in a computing system with a clock period of 0.5 microseconds (µs). **Instructions:** 1. **Counting Mechanism:** - The program must initiate a counter starting at FFH and decrement it with each clock cycle until it reaches 00H. - Upon reaching 00H, the counter resets to FFH, creating a continuous loop. 2. **Timing Control:** - To ensure that the counting is perceivable, incorporate a delay of 1 millisecond (ms) between each count decrement. - This is achieved using register C to manage the timing delay by aligning it with the clock cycle. 3. **Output:** - The program should output the current count value via one of the system’s output ports for real-time monitoring. **Technical Details:** - **Clock Period:** 0.5 µs - **Required Delay:** To achieve a 1 ms delay, calculate the necessary number of clock cycles based on the clock period. - \[\text{Number of Cycles} = \frac{1 \text{ ms}}{0.5 \text{ µs}} = 2000 \text{ cycles}\] - **Implementation Steps:** - Initialize the counter at FFH. - Use register C to facilitate a loop that counts 2000 clock cycles, creating the required delay. - Decrement the hexadecimal counter. - Output the count at each step through the designated port. - Reset counter upon reaching 00H. **Use Case:** This program can be an educational exercise in embedded systems programming and understanding of microcontroller operations, especially in managing time delays and output operations.
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