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What is an accumulator in microprocessor?
the accumulator is an 8-bit register then is part of the arithmetic/logic unit(ALU). this register is used to store to store 8-bit data and to perform arithmetic & logical operation. the result of an operation is stored in the accumulator. the accumulator is also identified as register A.
Where result of arithmetic or logic operation is formed?
The result of an arithmetic or logic operation is typically formed in a temporary storage location known as a register within the CPU. After the operation is executed, the result can be stored in memory or written back to a variable in a program, depending on the context of the computation. This process allows for efficient processing and retrieval of data during calculations.
Can arithmetic be performed in the instruction register?
yes
What is the status zero flag when the result of an arithmetic operation is zero?
The status zero flag is a specific bit in the status register of a CPU that indicates whether the result of an arithmetic operation is zero. When an operation produces a zero result, the zero flag is set (usually to 1), signaling that the last operation resulted in a zero value. This flag is crucial for conditional branching and decision-making in programming, as it helps determine the flow of execution based on the outcome of previous calculations.
What do you mean by arithmetic overflow?
arithmetic overflow is a situation that occurs when a calculation or operation yields a result that is too large for the system storage or register to handle. Overflow can also refer to the amount the result exceeds the memory designated for storage. ( basically too much, That's why its called overflow)
What is the difference between conditional and control flags in 8086 microprocessor?
Control Flag Register: The Control Flag Register (CFR), also known as the Program Status Word (PSW), is a register used to control the execution flow and behavior of the processor. It typically stores various control flags that govern different aspects of the CPU's operation. Some common flags found in the Control Flag Register include: Carry Flag (CF): Used to indicate whether an arithmetic operation generated a carry or borrow. Zero Flag (ZF): Indicates whether the result of an operation is zero. Sign Flag (SF): Indicates the sign (positive or negative) of the result. Overflow Flag (OF): Indicates whether an arithmetic operation resulted in an overflow. Interrupt Flag (IF): Determines whether interrupts are enabled or disabled. The Control Flag Register provides control over program execution, including branching, interrupt handling, and arithmetic operations. It helps determine the outcome of operations and can be used for conditional branching based on specific flag states. Conditional Flag Register: The Conditional Flag Register (CFR), also known as the Condition Code Register (CCR) or Status Register (SR), contains flags that reflect the result of the most recent arithmetic or logical operation performed by the processor. These flags are used to perform conditional branching and control the flow of instructions based on specific conditions. The flags present in the Conditional Flag Register can vary depending on the processor architecture, but some common flags include: Zero Flag (ZF): Indicates whether the result of an operation is zero. Sign Flag (SF): Indicates the sign (positive or negative) of the result. Overflow Flag (OF): Indicates whether an arithmetic operation resulted in an overflow. Carry Flag (CF): Used to indicate whether an arithmetic operation generated a carry or borrow. Auxiliary Carry Flag (AF): Indicates a carry or borrow from the lower-order nibble (4 bits) to the higher-order nibble. The Conditional Flag Register is primarily used for conditional jumps or branches, allowing the processor to alter the program flow based on the current flag states. To summarize, the Control Flag Register focuses on controlling the processor's behavior and handling interrupts, while the Conditional Flag Register reflects the outcome of arithmetic and logical operations and enables conditional branching based on flag states.
Explain Arithmetic micro operation?
The basic arithmetic micro operations are addition, subtraction, increment, decrement, and shift. The arithmetic micro operation defined by the statement:- R3
Which unit of computer performs arithmetic and logical functions?
The ALU (arithmetic logic unit) An ALU loads data from input registres, an external Control Unit then tells the ALU what operation to perform on that data, and then the ALU stores its result into an output register. Other mechanisms move data between these registers and memory.
What is an ax register?
It is one of 4 registers called general purpose registers Ax has a another name witch is (accumulator) it used in arithmetic and logic operation and store data from I/o port in microprocessors like 8086/8088
What is the error that occurs when a number becomes too large for the computer to register it?
Arithmetic overflow.
Why accumulator is called a special register?
Accumulator contains one of the operand for any operation which is performed by the ALU.The result of the operation is stored in the Accumulator. thus it is a special register
Is accumulator a general purpose register?
Yes and no. You can use it as a general purpose register, but if you do that, you will lose the ability to perform arithmetic and logical computations and comparisons that would normally use the accumulator.
