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CS 206D Computer Organization Lab3

CS 206D Computer Organization Lab3. LOOP Instruction. The LOOP instruction can be used to implement a for loop. Syntax : ; initialize CX to loop_count destnation_lable: ; body of the loop LOOP destnation_lable. LOOP instruction.

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CS 206D Computer Organization Lab3

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  1. CS 206D Computer Organization Lab3 CS 111

  2. LOOP Instruction • The LOOP instruction can be used to implement a for loop. • Syntax: ; initialize CX to loop_count destnation_lable: ; body of the loop LOOP destnation_lable CS 111

  3. LOOP instruction • The counter for the loop is the register CX, which is initialized to loop_count. • Execution of the LOOP instruction causes CX to be decremented automatically. • If (CX < > 0) control transfers to destination_label else the next instruction after LOOP is done. CS 111

  4. For loop • Example: Write some code to display a row of 20 stars. • Solution: • Pseudo code: • FOR 20 times DO • display '*' • END_IF CS 111

  5. For loop • Example: Write some code to display a row of 20 stars. It can be coded as follows: MOV CX, 20 ; initialize CX to 80 MOV AH, 2 MOV DL, '*' TOP: INT 21h LOOP TOP CS 111

  6. Exercise : • Example: Write some code to display all English alphabets (A TO Z) CS 111

  7. Exercise : • Example: Write some code to display all English alphabets (A TO Z) CS 111

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