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?

Define grid computing, Question 1 Define Grid computing Question 2 ...

Question 1 Define Grid computing Question 2 Explain Attribute-Based Programming Model for Grid Services Question 3 What are the characteristics that users/applicat

Operating system, Operating System: Operating  System is the software ...

Operating System: Operating  System is the software that manages all the computers' resources to optimize its performance provides common services for efficient execution of v

Write a program to solve a maze 10x10, write a program to solve a 10x10 maz...

write a program to solve a 10x10 maze. prompt the user for an input text file containing ten rows(ten characters on each row). Use following characters in the input file: * startin

#title, what is HMtl stands for, meaning and purpose

what is HMtl stands for, meaning and purpose

Magnetic media, what are the five precautions to be observed when handling ...

what are the five precautions to be observed when handling magnetic media?

Data structures, let me know if you can do this assignment and how long it ...

let me know if you can do this assignment and how long it takes

Computer, identify application software from the list? ms excel linux inter...

identify application software from the list? ms excel linux internet explorer adobe photshop sound card driver window disk manger adobe dream weaver windows file explorer

Internet searching algorithm, Internet searching algorithm: Searching: Wh...

Internet searching algorithm: Searching: When a user enters a query into a search engine, the engine examines its index and provides a listing of best-matching web pages accordin

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