Question
Add the content of memory location B to Accumulator Register
Answer :
Word Count : 1195
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Skip in 10
In Computer Organization and Assembly Language Programming, the operation “Add the content of memory location B to Accumulator Register” represents a basic arithmetic operation in which the value stored at a particular memory location is added to the value currently present in the Accumulator (AC) register. The result of the addition is generally stored back in the Accumulator. This operation demonstrates the interaction between the memory unit, accumulator, arithmetic and logic unit (ALU), and control unit of a computer system. The Accumulator is a special-purpose register used extensively by the CPU for arithmetic and logical operations. It temporarily stores operands and intermediate results during instruction execution. A memory location, represented here by B, contains a data value that is required for the addition. The instruction therefore instructs the processor to retrieve the value stored at memory location B and add it to the value already available in the Accumulator. The operation can be represented using the following symbolic notation: AC ← AC + M[B] Here, AC represents the Accumulator Register, and M[B] represents the contents of memory location B. The arrow indicates that the result of the addition is transferred to the Accumulator. The original value in memory location B remains unchanged unless a separate instruction modifies it. For example, suppose the Accumulator contains the value 25 and memory location B contains the value 15. When the instruction to add the content of B to the Accumulator is executed, the processor performs: AC ← 25 + 15 Therefore: AC ← 40 The value 40 is stored in the Accumulator, while the value 15 at memory location B remains unchanged. The execution of this instruction involves several important steps. First, the CPU must fetch the instruction from memory. The Program Counter (PC) contains the address of the next instruction to be executed. The address is transferred to the Memory Address Register (MAR), and the instruction is obtained from memory and transferred to the Memory Data Register (MDR). The instruction is then transferred to the Instruction Register (IR). The control unit decodes the instruction to determine that an addition involving memory location B is required. After decoding, the processor identifies the address of memory location B. This address is placed in the MAR. The memory unit uses the address to locate the required data.
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