Question

Consider an 8051 microcontroller system which takes numeric inputs between 1 and 26 from the user through the Port P2. The numeric value " 1 " is mapped to the character "A", "2" is mapped to "B" and likewise "26" is mapped to "Z". Process the received numeric input in such a way that you transfer the mapped character of it via serial communication with a baud rate of 9600 . Assume the crystal frequency of the 8051 microcontroller is 25.8048MHz. Write an 8051 assembly language program to implement the same. [Note: The ASCII code for A to Z starts from 41H(A) to 5AH(Z)]

Answer 1

The question involves creating an 8051 assembly language program to map numeric inputs to ASCII characters and transmit them over serial communication, considering the timing for a baud rate of 9600 given a specific crystal frequency.

Step-by-step explanation:

A student is asking about writing an 8051 assembly language program to map numeric inputs to corresponding ASCII characters and transmit them over serial communication at a baud rate of 9600 with a crystal frequency of 25.8048MHz on an 8051 microcontroller.

The program must take numeric input from Port P2 where the inputs range from 1 to 26, with each number representing a letter of the English alphabet ('1' for 'A', '2' for 'B', ..., '26' for 'Z').

The ASCII codes for 'A' to 'Z' are from 41H to 5AH. The program should read the input, convert it to the corresponding ASCII character, and send it via serial communication. The baud rate of 9600 is set by configuring the Timer 1 register based on the microcontroller's crystal frequency. In this scenario, the registers of the 8051 microcontroller must be programmed correctly to accomplish the task.