What are the different types of processor registers?

These are classified as given below.

• Accumulator: This is the most frequently used register used to store data taken from memory. …
• Memory Address Registers (MAR): …
• Memory Data Registers (MDR): …
• General Purpose Registers: …
• Program Counter (PC): …
• Instruction Register (IR): …
• Condition code register ( CCR ) :

A processor register (CPU register) is One of a small set of data holding places that are part of the computer processor. A register may hold an instruction, a storage address, or any kind of data (such as a bit sequence or individual characters). Some instructions specify registers as part of the instruction.

Memory address register (MAR) memory data register (MDR) current instruction register (CIR)

Almost all the RISC architectures that have 32 registers exposed in the instruction set actually have 32 integer registers and 32 more floating point registers (so 64). (Floating point “add” uses different registers than integer “add”.)

Linguist Martin Joos defined five main types of language register: Frozen, formal, consultative, casual, and intimate.

There are two types of registers in computer architecture. Some registers are internally in the processor while the other one is user-accessible. These two types of registers in computer architecture differ in their accessibility to computer architecture.

A processor often contains several kinds of registers, which can be classified according to their content or instructions that operate on them: User-accessible registers can be read or written by machine instructions. The most common division of user-accessible registers is into data registers and address registers.

There are different types of registers, including memory address registers, memory buffer registers, input output address registers, and input output buffer registers and shift registers.

Internal registers include the Instruction register (IR), memory buffer register (MBR), memory data register (MDR), and memory address register (MAR). The instruction register fetches instructions from the program counter (PC) and holds each instruction as it is executed by the processor.

A brief description of most important CPU’s registers and their functions are given below:

• Memory Address Register (MAR): …
• Memory Buffer Register (MBR): …
• I/O Address Register (I/O AR):I/O Address register is used to specify the address of a particular I/O device.
• I/O Buffer Register (I/O I3R): …
• Program Counter (PC)

Different Types of Registers

• MAR Register. Memory Address Registers (MAR) are the complete version of MAR. …
• MDR. A memory data register is used to hold data that will be stored or fetched from the computer memory, also known as random-access memory (RAM). …
• MBR. …
• PC. …
• Accumulator. …
• Index Register.

There are two types of registering in the memory data register. When the data is fetched from the memory and copied to the MDR the information is stored in one single direction and the data is written by other CPU registers that store data in computer memory.

(a) General Purpose Registers –

The 8085 has six general-purpose registers to store 8-bit data; these are identified as- B, C, D, E, H, and L. These can be combined as register pairs – BC, DE, and HL, to perform some 16-bit operation.