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Systems Architecture (Components (PC (Program Counter (The program counter…
Systems Architecture
Components
PC
Program Counter
The program counter, commonly called the instruction pointer in Intel x86 and Itanium microprocessors, and sometimes called the instruction address register, the instruction counter, or just part of the instruction sequencer, is a processor register that indicates where a computer is in its program sequence.
MAR
Memory Address Register
In a computer, the Memory Address Register (MAR) is the CPU register that either stores the memory address from which data will be fetched from the CPU, or the address to which data will be sent and stored. In other words, MAR holds the memory location of data that needs to be accessed.
MDR
Memory Data Register
A memory buffer register (MBR), commonly referred to as a memory data register (MDR) is the register in a computer's processor, or central processing unit, CPU, that stores the data being transferred to and from the immediate access storage.
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Accumulator
An accumulator is a register for short-term, intermediate storage of arithmetic and logic data in a computer's CPU (central processing unit).
ALU
Arithmetic Logic Unit
An arithmetic logic unit (ALU) represents the fundamental building block of the central processing unit of a computer. An ALU is a digital circuit used to perform arithmetic and logic operations.
CU
Control Unit
The control unit (CU) is a component of a computer's central processing unit (CPU) that directs operation of the processor. It tells the computer's memory, arithmetic/logic unit and input and output devices how to respond to a program's instructions
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