22. Addressing Modes, Instruction Set and Instruction Execution Flow
The chapter covers the fundamentals of instruction execution within the CPU, focusing on the fetch, decode, and execute cycle of instructions. It discusses different addressing modes and the concept of interrupts that allow CPUs to manage multiple tasks efficiently. Key concepts include how instructions are fetched and decoded, and the various types of operations a CPU can perform based on the decoded instruction.
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What we have learnt
- Instruction execution involves fetching, decoding, and executing instructions in a CPU.
- Different addressing modes affect how operands are accessed in memory.
- Interrupts allow CPUs to temporarily halt the execution of a program to handle other tasks.
Key Concepts
- -- FetchExecute Cycle
- The process in which a CPU fetches an instruction from memory, decodes it to determine the operation, and executes the instruction.
- -- Addressing Modes
- Methods used to specify the operands for instructions, including direct, indirect, and immediate addressing.
- -- Interrupts
- Signals that temporarily halt the CPU's current operations to address an immediate task, such as responding to user input.
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