Understanding the Fetch-Decode-Execute Cycle

The video explains the fetch-decode-execute cycle, detailing how a CPU processes instructions. It covers basic computer operations, key components like memory and CPU, and stages of the cycle. The video also discusses program branching and provides an example of program execution, illustrating how high-level code is processed by a CPU.

What are the three main stages of the fetch-decode-execute cycle?

• Load, Store, Execute

• Input, Process, Output

• Fetch, Decode, Execute

• Read, Write, Execute

What is the role of the program counter during the fetch stage?

• It executes the instruction.

• It decodes the instruction.

• It holds the address of the next instruction to be executed.

• It stores the current instruction being executed.

Which register holds the address of the next instruction to be executed?

• Memory Address Register

• Program Counter

• Current Instruction Register

• Memory Data Register

What are the two parts of an instruction during the decode stage?

• Fetch and Execute

• Opcode and Operand

• Address and Data

• Instruction and Data

What does the operand part of an instruction contain?

• The actual data or the address of the data

• The operation to be performed

• The result of the operation

• The address of the next instruction

During the execution stage, where is the data from the memory location 0101 loaded?

• Current Instruction Register

• Accumulator

• Program Counter

• Memory Data Register

What happens to the program counter after an instruction is fetched?

• It is copied to the memory address register.

• It is incremented to point to the next instruction.

• It is decremented.

• It is reset to zero.

In the example program, what does the instruction with opcode 0011 do?

• Adds data to the accumulator

• Stores data from the accumulator into memory

• Loads data into the accumulator

• Outputs data from the accumulator

What is the purpose of the branch instruction in a program?

• To load data into the accumulator

• To store data into memory

• To increment the program counter

• To allow the program to jump to a different memory location

What is the final result of the example program discussed in the video?

• The number 3 is output to the user.

• The number 4 is output to the user.

• The number 0 is output to the user.

• The number 1 is output to the user.