Summary
This chapter described the primary functional units of a simple processor, consisting of the control unit, the ALU, and the registers. An overview of processor instructions and addressing modes followed. The instruction categories implemented by the 6502 processor were introduced with the intent of demonstrating the variety and utility of instructions available in a simple processor architecture.
The concepts involved in interrupt processing were introduced and demonstrated in the context of the 6502 architecture. This chapter concluded with an overview of the most common architectural approaches to input/output operations (memory-mapped I/O and port-mapped I/O) and the basic modes of performing I/O in a computer system (programmed I/O, interrupt-driven I/O, and DMA).
Having completed this chapter, you should now possess a conceptual understanding of processor functional units, instruction processing, interrupt handling, and input/output operations. This information forms...
