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?

Overall functions , OVERALL FUNCTIONS : There are three points that must b...

OVERALL FUNCTIONS : There are three points that must be borne firmly in mind when considering the use of computers in laboratory management. Overall Function This includes

A brief introduction of python, Python is an interpreted, high-level, inter...

Python is an interpreted, high-level, interactive and object oriented-scripting language. Python was designed to be extremely readable which uses English keywords commonly where as

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

Computers, Computers One of the most  important invention in the desig...

Computers One of the most  important invention in the design of digital  circuits  is that  of the general- purpose "stored program" computer or device. Computers are a partic

Management information system, suggest 5 ways by which new products and ser...

suggest 5 ways by which new products and services can be developed using management information system

What is the intent of the singleton pattern, QUESTION Consider a Univer...

QUESTION Consider a University system which has several sub systems: Student Registration Module Registration Time Tabling Library System Human Resource Manag

What is the main principle of an operating system?, The operating system i...

The operating system is the layer among the hardware and the programs you run. It provides programs a standard interface to the hardware; or else every program would need to includ

Visual Basic 2012, Can someone help me write a code for force = mass * acce...

Can someone help me write a code for force = mass * acceleration.

Computer, hitory and genration of computer

hitory and genration of computer

Pipelining, tellme the types of pipelining

tellme the types of pipelining

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