Basic Arithmetic Operation

Explanation

1. Purpose

This program demonstrates a bitwise XOR (Exclusive OR) operation by comparing two identical 8-bit values. It illustrates how XORing any value with itself results in zero, a standard technique used in assembly to clear a register.

2. Key Concepts

• Immediate Addressing (MVI): Loading fixed data values directly into registers.
• Bitwise XOR (XRA): Comparing corresponding bits where identical bits result in 0 and different bits result in 1.
• Register Clearing: An efficient low-level method to reset the Accumulator to zero.

3. Code Walkthrough

| Code | Explanation | | :--- | :--- | | MVI A, 0FFH | Loads the hex value FF (binary 11111111) into Register A (Accumulator). | | MVI B, 0FFH | Loads the hex value FF (binary 11111111) into Register B. | | XRA B | Performs A XOR B (11111111 XOR 11111111) and stores the result back in Register A. | | HLT | Halts (stops) the execution of the program. |

4. Output

• Register A (Accumulator): 00H (binary 00000000)
• Zero Flag (Z): 1 (Set to true, because the operation result is zero)