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?

Data mining test, Use the methods of C4.5 to design a decision tree

Use the methods of C4.5 to design a decision tree

Many to many relationships, Each Many to Many relationship type maps into t...

Each Many to Many relationship type maps into the Table. The primary key of this relevant is the combination of the primary keys of the participating entity types. These are also c

List the various applications of ai, Question 1 What are the important Iss...

Question 1 What are the important Issues in Search Problem Question 2 What do you mean by Predicates? Briefly explain Question 3 What are the advantages of Wireles

Turn-around, The term ‘page traffic’ describes

The term ‘page traffic’ describes

What is Load and store the assembly programs?, It would not emerge practica...

It would not emerge practical to type an entire program each time it is required, and to avoid this it is possible to store a program on the disk, with the vast advantage that by b

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

Explain Canonical cover and Extraneous Attributes with examples.

Twisted pairs, Twisted Pairs: Twisted pairs are familiar to all of us ...

Twisted Pairs: Twisted pairs are familiar to all of us as the copper wire telephone lines. These are of low frequency, and support a limited bandwidth (one voice channel) but

Define the elements of contlor unit , The three main elements of the con...

The three main elements of the control unit are: 1. Decoder this is used to decode the instructions that create a program when they are being processed, and to establish in what ac

What is i-node number, Question 1 Bring out the advantages of Linux Ope...

Question 1 Bring out the advantages of Linux Operating systems Question 2 Match the Symbols with their respective file types              Symbol               File N

Principal structures in flow charting, PRINCIPAL STRUCTURES IN FLOW CHARTIN...

PRINCIPAL STRUCTURES IN FLOW CHARTING Structured programing calls for the usage of four principal structures to help simplify the program. They are:     Sequential contro

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