Special Purpose Registers. (a) Register A(Accumulator) - Register A is an 8-bit register used in 8085 to perform arithmetic, logical, I/O & LOAD/STORE operations. Register A is quite often called as an Accumulator. ... And the result of the arithmetic operation will be stored or accumulated in this register.

Is accumulator a general purpose register?

Modern computer systems often have multiple general-purpose registers that can operate as accumulators, and the term is no longer as common as it once was. However, to simplify their design, a number of special-purpose processors still use a single accumulator.

Which are special purpose registers?

A special purpose register is one that has a specific control or data handling task to carry out. There are a number of special purpose registers within the CPU. The diagram above shows that the CPU contains a number of registers in order to process data and to follow program instructions.

What is the purpose of accumulator register?

An accumulator is a type of register included in a CPU. It acts as a temporary storage location which holds an intermediate value in mathematical and logical calculations. Intermediate results of an operation are progressively written to the accumulator, overwriting the previous value.

What is a special type of register?

A Special Function Register (or Special Purpose Register, or simply Special Register) is a register within a microprocessor, which controls or monitors various aspects of the microprocessor's function.

Special-Purpose Registers (PC, ACC, MAR and MDR)

23 related questions found

What is accumulator register in computer architecture?

An accumulator is a register for short-term, intermediate storage of arithmetic and logic data in a computer's CPU (central processing unit). ... The most elementary use for an accumulator is adding a sequence of numbers.

Which of the following is not considered as special purpose register?

Which of the following is not a special function register? Explanation: Accumulator is a general function register, which can be used for multiple functions. Explanation: SP is the short form of stack pointer which store address of stack top. 7.

Is accumulator a 16 bit register?

Accumulator: The accumulator is an 8-bit register (can store 8-bit data) that is the part of the arithmetic and logical unit (ALU).

What is the function of accumulator in 8051 microcontroller?

A or Accumulator (ACC)

The Accumulator or Register A is the most important and most used 8051 Microcontroller SFRs. The Register A is located at the address E0H in the SFR memory space. The Accumulator is used to hold the data for almost all the ALU Operations.

What is general purpose register?

General purpose registers are used to store temporary data within the microprocessor. ... It is of 16 bits and is divided into two 8-bit registers BH and BL to also perform 8-bit instructions. It is used to store the value of the offset.

What are the special purposes registers in 8085?

The Special purpose registers are Accumulator (A), Flag Register, Instruction Register(IR), Program Counter (PC) and Stack Pointer (SP).

What is accumulator in microprocessor?

The accumulator is an 8-bit register that is a part of arithmetic/logic unit (ALU). This register is used to store 8-bit data and to perform arithmetic and logical operations. The result of an operation is stored in the accumulator. The accumulator is also identified as register A. Flags.

What are types of registers?

There are different types of Registers that are used. Some of the most used Registers are accumulator, data register, address register, program counter, memory data register, index register, and memory buffer register.

Which types of register known as special purpose registers explain?

Special purpose registers ( SPR ) hold program state; they usually include the program counter (aka instruction pointer), stack pointer, and status register (aka processor status word).

What is the difference between general purpose register and special purpose register?

General purpose – These do not have side effects, can be used by most instructions. One can do arithmetic with them, use them for memory addresses, and so on. Special purpose – Registers which do not have side effects, but can only be used for certain purposes and only by certain instructions.

What special purpose does the ECX register serve?

What special purpose does the ECX register serve? Loop counter. Besides the stack pointer (ESP), what other register points to variables on the stack?

Is accumulator a general purpose register in 8051?

8051 Registers

The part of memory which is used for general purpose is called as RAM, and the memory used for Special Function Register (SFR) contains all the peripheral related registers like Accumulator, 'B' register, Timers or Counters, and interrupt related registers.

What are the special purpose register of 8051?

Instead, some special registers in some processor architectures require special instructions to modify them. In the 8051, register A, B, DPTR, and PSW are a part of the group of registers commonly referred to as SFR (special function registers). An SFR can be accessed by its name or by its address.

Which register is similar to accumulator in 8051?

The "B" register is very similar to the Accumulator in the sense that it may hold an 8-bit (1-byte) value. The "B" register is used only by two 8051 instructions: MUL AB and DIV AB.

Which bit if accumulator is used for serial output of data?

Bit 6: This is the serial output enables (SOE) bit. If this bit = 0, SIM instruction is not being used for serial output of data. In such a case, the MS bit of Accumulator is not having any useful information.

Why accumulators are used in microprocessor?

All microprocessors make use of an accumulator register that can supply one number for an action, and where the result of an action will also be stored. The size of the accumulator in terms of bits is used as a measure of the data unit capability of the microprocessor (as 8-bit, 16-bit, 32-bit, 64-bit, and so on).

How many types of accumulator registers are there?

There are different types of Registers that are used. Some of the most used Registers are accumulator, data register, address register, program counter, memory data register, index register, and memory buffer register.

What are the 5 flag registers?

Flags register in 8085 Microprocessor

• Carry flag (Cy),
• Auxiliary carry flag (AC),
• Sign flag (S),
• Parity flag (P), and.
• Zero flag (Z).

Which of the following is not a register?

Which of the following is not a visible register? Explanation: MAR or the memory address register is not a visible register.

What is register to register architecture?

In computer engineering, a register–memory architecture is an instruction set architecture that allows operations to be performed on (or from) memory, as well as registers. If the architecture allows all operands to be in memory or in registers, or in combinations, it is called a "register plus memory" architecture.