In the program below Convert the character in R0 from upperc

In the program below. Convert the character in R0 from upper-case to lower-case by operating on it, NOT replacing it. The lower-case converted character should stay in R0. Hint: See ASCII table and the difference between ‘A’ and ‘a’

AREA Upper2LowerCase, CODE, READONLY

ENTRY

EXPORT __main

__main

MOV R0, #\'A\'

; write your code here

stop B stop

END

Please write a code

Solution

AREA Upper2LowerCase, CODE, READONLY

ENTRY

EXPORT __main

__main

MOV R0, #\'A\'

   MOV A, R0

add A, 20H (Since the difference between the ASCII value of \'A\' and \'a\' is 20H

ASCII of A = 41 = 0100 0001

ASCII of a = 61 = 0110 0001

There for to convert uppercase to lowercase we can add 20 to ASCII of A to get \'a\')

   MOV R0, A

  stop B stop

END