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?

Assignment Help, How would you format while loops to fufill my project writ...

How would you format while loops to fufill my project write up?

Synchronous and asynchronous transmission, Synchronous and Asynchronous Tra...

Synchronous and Asynchronous Transmission: Another method of setting of terminals denotes synchronous or asynchronous transmission. Many terminals can only communicate in one

Diffrence Between FAT 32 And NTFS.., Dear sir please define what is the dif...

Dear sir please define what is the difference between FAT 32 and NTFS .

Unix fork program help, Will someone be able to help me with this I have tw...

Will someone be able to help me with this I have two text files that I can send. I am confused, is someone looking at this or is it still waiting to be assigned? this is the code

Java programming, what are the phases of oo progarmming or java?

what are the phases of oo progarmming or java?

Central processing unit (cpu), Central Processing Unit (CPU): The CPU ...

Central Processing Unit (CPU): The CPU is the physical device that controls computer operations. It is considered as the 'brain' of the computer system. The CPU comprises thre

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

Cmis, how much it cost for 8 week class

how much it cost for 8 week class

Types of pc, TYPES OF PC:  In general,  basic function of all the comp...

TYPES OF PC:  In general,  basic function of all the computers is same i.e. Computers accept data as input, perform operations on these data and generates the desired output t

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