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POHandling of Hexadecimal numbers for 8051 Assembly
 

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  1. POHandling of Hexadecimal numbers for 8051 Assembly
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    <p>I am having trouble looping through the Hexadecimal numbers in 8051 Assembly for proper subtraction,</p> <p>Here is the simple code that iterate 30 times and shows value from 40 to 70 (40,41,42,43,....70)</p> <pre><code> MOV A,#40H ;first value of the loop MOV R0,#0H MOV R1,#30 ;Number of iterations LOOP: ADD A,R0 DA A ;To Adjust the decimal values after each addition INC A DJNZ R1,LOOP END </code></pre> <p>This is how it is adjusting each value,</p> <pre><code>; 40H = 64D --(+0D)--&gt; 64D = 40H ; 41H = 65D --(+0D)--&gt; 65D = 41H ; 42H = 66D --(+0D)--&gt; 66D = 42H ; 43H = 67D --(+0D)--&gt; 67D = 43H ; 44H = 68D --(+0D)--&gt; 68D = 44H ; 45H = 69D --(+0D)--&gt; 69D = 45H ; 46H = 70D --(+0D)--&gt; 70D = 46H ; 47H = 71D --(+0D)--&gt; 71D = 47H ; 48H = 72D --(+0D)--&gt; 72D = 48H ; 49H = 73D --(+0D)--&gt; 73D = 49H ; 4AH = 74D --(+6D)--&gt; 80D = 50H </code></pre> <p>But when i want to reverse the loop i.e if i want the output in reverse order from 70 to 40 (70,69,68,67,66,65,64,.....40)</p> <p>what should i have to do ?</p> <p>Here is the example how it should work if the first number is 90</p> <pre><code>; 90H = 144D --(+0D)--&gt; 144D = 90H ; 8FH = 143D --(-6D)--&gt; 137D = 89H ; 8EH = 142D --(-6D)--&gt; 136D = 88H ; 8DH = 141D --(-6D)--&gt; 135D = 87H ; 8CH = 140D --(-6D)--&gt; 134D = 86H ; 8BH = 139D --(-6D)--&gt; 133D = 85H ; 8AH = 138D --(-6D)--&gt; 132D = 84H </code></pre> <p>but since there is nothing for Decimal Adjust after subtraction how could i achieve the desired result ?</p> <p>The desired output,</p> <p>90 89 88 87 86 85....</p>
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    1. COYour question doesn't make sense. You've included some kind of output, but your code does not produce any output. Your output also doesn't make any sense. 64 decimal does not equal 43 hexadecimal.
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      1. USNovaDenizen
    2. COThe program is working fine on Keil, i can see the value of 'A' updating on every iteration , the values are updated as followos, 40,41,42,43,44,45,46,47,48,49,4a(50)...... and you statement " 64 decimal does not equal 43 hexadecimal." ...fixed ! sorry
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    3. CO"but since there is nothing for Decimal Adjust after subtraction" makes no sense. "how could i achieve the desired result ?" What is your desired result? DA appears to be working fine.
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      1. USNovaDenizen
 

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