📖 5. The 8085 Microprocessor
📖 From An Introduction To Microprocessor 8085 • 215 questions available
About 5. The 8085 Microprocessor
The Big Idea: This is the "main character" of your course! The 8085 is the real, commercially successful 8-bit microprocessor you’ve been building up to. Think of it as a powerful SAP-III with all the extra hardware details needed to work in the real world. It has a well-defined set of registers (a more advanced accumulator, temporary registers, and a flag register), an 8-bit data bus, and a 16-bit address bus that allows it to access up to 64KB of memory. You will learn all its pins, signals, and internal architecture.
How It Works: The chapter explains the "architecture" of the 8085. You'll learn about its various registers (like the General-Purpose Registers B, C, D, E, H, L, which can be paired to hold 16-bit data), the Program Counter, and the Stack Pointer. Crucially, you will study its pin diagram and understand the different "machine cycles"—the specific steps the processor takes to read an instruction from memory (Opcode Fetch) or read/write data (Memory or I/O Read/Write). This is where you connect the theoretical "fetch-execute" cycle to actual, physical electrical signals.
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🔄 Last updated: 2026-07-30