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?

Explain the types of memory and explain how each work, Problem: a) ...

Problem: a) Explain the basic functions of a computer: inputting, processing, storing and outputting. b) List four types of memory and explain how each wor

How to set up the location (e.g. plaza, how to set up the location (e.g. pl...

how to set up the location (e.g. plaza, hall of fame, lecture theater or etc.) and services that will be used during the exhibition; devices needed; and finally produced a compreh

Algorithm writing, algorithm to simulate railway reservation process

algorithm to simulate railway reservation process

Working principle of master slave j-k flip flop, Problem 1. Obtain the ...

Problem 1. Obtain the set of prime implicants for f = Σ m (0,1,6,7,8,9,13,14,15) . Obtaining the set of prime implicants: 2. Draw the logic diagram of a divide by

Data structures hw help, Create an implementation of the Ordered Associativ...

Create an implementation of the Ordered Associative Array API using left-leaning red-black trees. Illustrate the use of the API by refactoring your WordBench as a client of Ordered

Access time - storage devices, Access time: Access time: This is the t...

Access time: Access time: This is the time required to locate and retrieve stored data from the storage unit in response to a program instruction. That is the time interval be

What is collaboration, Question 1 What is Collaboration? Write down the ob...

Question 1 What is Collaboration? Write down the objectives of collaboration Question 2 What is proxy server? Write down the reasons for using proxy server Question

Java program, To find the minimum number of shelves in the loading process ...

To find the minimum number of shelves in the loading process in cars

How to crack a password, how can i crack the password of vmware virtual mac...

how can i crack the password of vmware virtual machine

Operating system, Operating system:  An operating system is system sof...

Operating system:  An operating system is system software which may be viewed as an organized collection of software consisting of procedures for operating  a computer and pro

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