What are visible registers?

User-Visible Registers A user-visible register is one that may be referenced by means of the machine language that the processor executes. That is, any general-purpose register can contain the operand for any opcode. This provides true general-purpose register use. Often, however, there are restrictions.

What is user register in CPU?

A register is a temporary storage area built into a CPU. Some registers are used internally and cannot be accessed outside the processor, while others are user-accessible. The instruction register fetches instructions from the program counter (PC) and holds each instruction as it is executed by the processor.

What are the functions of following register?

Following is the list of some of the most common registers used in a basic computer:

Register	Symbol	Function
Data register	DR	Holds memory operand
Address register	AR	Holds address for the memory
Accumulator	AC	Processor register
Instruction register	IR	Holds instruction code

Which of the following is the example of user visible register?

By saying “user visible register” registers you actually mean “architectural registers”. For example, in the Intel x86_32 platforms AX, BX, CX, DX, SP, SI, DI etc are architectural registers. You see these registers in the assembly programs.

Which is not a user visible register?

Explanation: MAR or the memory address register is not a visible register. This register is user inaccessible. It contains the address of the memory block to be read or written to.

What are the program invisible registers?

– The program invisible registers are used to access and specify the address tables of global and local descriptor tables. – Since these types of register cannot be accessed directly by a program they are called invisible registers.

What is register in computer organization and architecture?

A Register is a fast memory used to accept, store, and transfer data and instructions that are being used immediately by the CPU. A Register can also be considered as a group of flip-flops with each flip-flop capable of storing one bit of information. s are transferred into a 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.

What is the function of user visible register?

Within the processor, there is a set of registers that provide a level of memory that is faster and smaller than main memory. The registers in the processor serve two functions: User-visible registers:These enable the assembly-language programmer to minimize main memory references by optimizing the use of registers.

What is the purpose of the Gdtr?

The Global Descriptor Table (GDT) is a data structure used by Intel x86-family processors starting with the 80286 in order to define the characteristics of the various memory areas used during program execution, including the base address, the size, and access privileges like executability and writability.

What are the functions of user visible registers?

User-visible registers: Enable the machine- or assembly-language programmer to minimize main memory references by optimizing register use.Control and status registers: Used by the processor to control the operation of the processor and by privileged, operating system routines to control the execution of programs.

What is the function of Register in computer architecture?

Registers in Computer Architecture. Register is a very fast computer memory, used to store data/instruction in-execution. A Register is a group of flip-flops with each flip-flop capable of storing one bit of information.

What are the registers used by the CPU?

The registers used by the CPU are often termed as Processor registers. A processor register may hold an instruction, a storage address, or any data (such as bit sequence or individual characters). The computer needs processor registers for manipulating data and a register for holding a memory address.

What is Register in computer memory?

Computer Registers. Registers are a type of computer memory used to quickly accept, store, and transfer data and instructions that are being used immediately by the CPU. The registers used by the CPU are often termed as Processor registers. A processor register may hold an instruction, a storage address, or any data