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What is the function of cu and alu


Jan 29, 2024
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What is the function of CU?

The control unit of the central processing unit regulates and integrates the operations of the computer. It selects and retrieves instructions from the main memory in proper sequence and interprets them so as to activate the other functional elements of the system at the appropriate moment…

What is the function of ALU *?

ALU is a part of the CPU that performs various computational functions on data. The function of an ALU: ALU is to perform mathematical operations such as addition, subtraction, multiplication and division.

What is CU and ALU in computer?

Difference Between ALU and CU is that arithmetic logic unit is another component of the processor which performs arithmetic, comparison, and other operations. While control unit is the component of the processor that directs and coordinates most of the operations in the computer.

What is CU ALU Mu?


What is the function of ALU in 8085 microprocessor?

ALU of 8085 performs 8-bit arithmetic & logical operations. The operations are generally performed with Accumulator as one of the operands. The result is saved in accumulator register.

What is ALU in microprocessor?

An arithmetic logic unit(ALU) is a major component of the central processing unit of the a computer system. … In some microprocessor architectures, the ALU is divided into the arithmetic unit (AU) and the logic unit (LU). An ALU can be designed by engineers to calculate many different operations.

What are the operations performed by the ALU of 8085?

The operations performed by ALU of 8085 are addition, subtraction, increment, decrement, logical AND, OR, EXCL U8IVE –OR, compare, complement and left / right shift.

What is the function of ALU in 8086 microprocessor?

ALU. It handles all arithmetic and logical operations, like +, −, ×, /, OR, AND, NOT operations.

What is ale microprocessor?

ALE (Address Enable Latch) is the control signal which is nothing but a positive going pulse generated when a new operation is started by microprocessor. … So when pulse goes high means ALE=1, it makes address bus enable and when ALE=0, means low pulse makes data bus enable.

How does the ALU affect the performance of a microprocessor?

Using its ALU (Arithmetic/Logic Unit), a microprocessor can perform mathematical operations like addition, subtraction, multiplication and division. … A microprocessor can move data from one memory location to another. A microprocessor can make decisions and jump to a new set of instructions based on those decisions.

What are the functions of 8086 microprocessor?

8086 Microprocessor is an enhanced version of 8085Microprocessor that was designed by Intel in 1976. It is a 16-bit Microprocessor having 20 address lines and16 data lines that provides up to 1MB storage. It consists of powerful instruction set, which provides operations like multiplication and division easily.

What are pointers and index register?

– Stack pointer and base pointer are the two pointer registers whereas the Source index and Destination index are the index group of registers. – They are primarily used to store relative to segment registers the locations of offset addresses of memory locations. They serve the purpose of being memory pointers.

What is the purpose of the queue in 8086?

In 8086, a 6-byte instruction queue is presented at the Bus Interface Unit (BIU). It is used to prefetch and store at the maximum of 6 bytes of instruction code from the memory. Due to this, overlapping instruction fetch with instruction execution increases the processing speed.

How many ALU are there in 8086?

While the x86 processor family has supported 64-bit processing for decades, the original 8086 was a 16-bit processor. As such, it has a 16-bit arithmetic logic unit (ALU). 1 The arithmetic logic unit is the heart of a processor: it performs arithmetic operations such as addition and subtraction.

Where is 8086 microprocessor used?

Intel 8086

A sixteen bit microprocessor chip used in early IBM PCs. The Intel 8088 was a version with an eight-bit external data bus.

What is the meaning of INR m instruction?

In 8085 Instruction set, INR is a mnemonic that stands for ‘INcRement’ and ‘R’ stands for any of the following registers or memory location M pointed by HL pair. R = A, B, C, D, E, H, L, or M. This instruction is used to add 1 with the contents of R. So the previous value in R will get increased by amount 1 only.

What is the maximum capacity of the memory that can be interfaced to the microprocessor which contains 16 address lines?

Difference between 8085 and 8086 Microprocessor

8085 Microprocessor8086 Microprocessor
It is an 8-bit microprocessor.It is a 16-bit microprocessor.
It has a 16-bit address line.It has a 20-bit address line.
It has a 8-bit data bus.It has a 16-bit data bus.
The memory capacity is 64 KB.The memory capacity is 1 MB.

What is the basic clock frequency and maximum memory capacity of 8086?

The 8086 (also called iAPX 86) is a 16-bit microprocessor chip designed by Intel between early 1976 and June 8, 1978, when it was released.

Intel 8086.

General information
Max. CPU clock rate5 MHz to 10 MHz
Data width16 bits
Address width20 bits
Architecture and classification

What microprocessor consists of?

Microprocessor consists of an ALU, register array, and a control unit. ALU performs arithmetical and logical operations on the data received from the memory or an input device. Register array consists of registers identified by letters like B, C, D, E, H, L and accumulator.

What is the maximum capacity of the memory that can be interfaced to the microprocessor which contains 20 address lines?


Microprocessor – 8086 Overview

It is a 16-bit Microprocessor having 20 address lines and16 data lines that provides up to 1MB storage.

How much memory can be interfaced maximum with the 8085 microprocessor justify the answer?

8085 has address bus of 16 bit, so it can index 2^16B . So 8085 support maximum of 64KB.

What is the maximum memory addressing and I O addressing capability of 8086?

8086 addresses via its A0–A19 address lines. Hence it can address 220 = 1MB memory. Address lines A0 to A15 are used for accessing I/O’s.

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