Suppose the memory cells at addresses 00 through 05 in the...

Suppose the memory cells at addresses 00 through 05 in the machine described in Appendix C contain the following bit patterns: $$\begin{array}{cc} \text { Address } & \text { Contents } \\ 00 & 22 \\ 01 & 11 \\ 02 & 32 \\ 03 & 02 \\ 04 & \mathrm{C} 0 \\ 05 & 00 \end{array}$$ Assuming that the program counter initially contained $00,$ record the contents of the program counter, instruction register, and memory cell at address 02 at the end of each fetch phase of the machine cycle until the machine halts.

Suppose the memory cells at addresses 00 through 05 in the machine described in Appendix C contain the following bit patterns:
$$\begin{array}{cc}
\text { Address } & \text { Contents } \\
00 & 22 \\
01 & 11 \\
02 & 32 \\
03 & 02 \\
04 & \mathrm{C} 0 \\
05 & 00
\end{array}$$
Assuming that the program counter initially contained $00,$ record the contents of the program counter, instruction register, and memory cell at address 02 at the end of each fetch phase of the machine cycle until the machine halts.

Key Concepts

Program Counter

The program counter is a register that holds the address of the next instruction to be fetched from memory. It is automatically incremented during the machine cycle and is essential for controlling the sequential flow of execution in a computing system.

Instruction Register

The instruction register is used to temporarily store the instruction fetched from memory during the fetch phase of the machine cycle. It isolates the instruction bits from memory, allowing the control unit to decode and execute the instruction without interference from the other ongoing memory operations.

Memory Addressing

Memory addressing involves the method by which a computer locates data or instructions stored in its memory. Each memory cell is assigned a unique address, and the computer uses these addresses to read from or write to specific locations, which is crucial for fetching instructions and manipulating data during execution.

Fetch Phase

The fetch phase is the first step in the machine cycle where the computer retrieves the instruction from the memory location pointed to by the program counter. This phase involves updating the instruction register with the fetched instruction while also adjusting the program counter for the next instruction, setting the stage for proper execution sequencing.

Machine Halt Condition

The machine halt condition represents a state in which the computer stops executing further instructions. It occurs when an instruction explicitly directs the system to cease operation or when a programmatically determined end of execution is reached, ensuring that the system does not perform any more cycles once processing is complete.

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