Question

Pins RA 3 of Port A is connected to LED3, Pushbutton1 is connected to RD6 of Port D and Pushbutton2 is connected to RD13 of Port D. Complete the program below which turns LEDS on if Pushbutton1 is pressed and LED3 off if Pushbutton2 is pressed. Use the CLR and SET register to change the state of the LED3. (Remember to use while(1)). Comments have been added to guide you in writing the code.

Answer 1

The question requires writing a microcontroller program to control an LED with two pushbuttons. The LED is turned on with Pushbutton1 and off with Pushbutton2 using a while loop with CLR and SET registers to control the LED's state.

Step-by-step explanation:

The student's question involves programming a microcontroller to control an LED using input from pushbuttons. A looping structure, such as while(1), is commonly used in microcontroller programming for continuous operation. The program will use the CLR and SET registers to turn LED3 on or off depending on the state of Pushbutton1 and Pushbutton2 respectively.

To accomplish the task, you will write a program that continuously checks the state of the pushbuttons. When Pushbutton1 is pressed (logic low at RD6), LED3 (connected to RA3) should be turned on, usually done by setting the relevant bit in the PORTA register. Conversely, when Pushbutton2 is pressed (logic low at RD13), LED3 should be turned off by clearing the corresponding bit in PORTA.