what is Decode or execution cycle?, Basic Computer Science

Assignment Help:
just the once the instruction has been fetched and is accumulated, the next step is to decode the instruction so as to work out what actions should be performed to execute it. This occupies examining the opcode to observe which of the machine codes in the CPU’s instruction set it communicates to, and also verifying which addressing mode needs to be used to get any required data.
Once the opcode is known, the execution cycle can take place. Different actions require to be carried out dependant on the opcode, without two opcodes requiring the same actions to occur. Though, there are usually four groups of different actions that can occur:
• Move of data between the CPU and memory.
• move of data between the CPU and an input or output devices.
• Processing of data, perhaps involving the use of the arithmetic and logic unit.
• A control operation, with the intention of change the sequence of subsequent operations. These can probably be conditional, based on the values stored at that point within the flag register.
For greater ease, and as describing all the possible instructions:
Mnemonic Description
MOV Moves a data value from one location to another
ADD Adds to data values using the ALU, and returns the result to the accumulator
STO Stores the contents of the accumulator in the specified location
END Marks the end of the program in memory

Related Discussions:- what is Decode or execution cycle?

Project, My son has a project assignment he has problem with. The only thin...

My son has a project assignment he has problem with. The only thing is, it is due in 20 mins. can someone be able to help him? if so, how much is the fee?

Processor, Processor: Processor plays major role in a computer. One sh...

Processor: Processor plays major role in a computer. One should carefully decide about the type of processor and its speed before making a choice. Currently Core 2 Duo process

Computer science, Explain Canonical cover and Extraneous Attributes with ex...

Explain Canonical cover and Extraneous Attributes with examples.

College management system project, E-R diagram and details for college mana...

E-R diagram and details for college management system

Central processing unit, The Central Processing Unit : Central Processing U...

The Central Processing Unit : Central Processing Unit (CPU) is the brain of the computer. The intricate electronic circuitry of the CPU performs the computer's tasks of handling d

String problem, c program to convert S to palindromes with minimum number o...

c program to convert S to palindromes with minimum number of character replacements

Multiprogramming, Multiprogramming Multiprogramming means capability of...

Multiprogramming Multiprogramming means capability of several programs to simultaneously occupy a portion of the computer’s memory and compete for central processor time. Th

Computer databases , COMPUTER DATABASES: As would be evident from the ...

COMPUTER DATABASES: As would be evident from the foregoing description, literature search is essentially a process of information retrieval. The term "Information Retrieval" w

Q1, Write a half-page summary explaining IP spoofing.

Write a half-page summary explaining IP spoofing.

Explain the term "algorithmic delay", QUESTION a) What is Time Division...

QUESTION a) What is Time Division Multiplexing (TDM), illustrate your answer with a diagram b) Describe four types of RTCP messages c) i) What is silence compression in I

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd