Microprocessor 8085 Ppt By Gaonkar May 2026

Accumulator (A): An 8-bit register that is part of every ALU operation.

The 8085 remains the perfect "sandbox" for students to understand how a CPU thinks before moving on to complex 64-bit architectures.

IO/M: Distinguishes between I/O operations and Memory operations. Interrupts microprocessor 8085 ppt by gaonkar

ALE (Address Latch Enable): Used to demultiplex the AD0–AD7 bus.

The instructions are the "language" of the processor. Gaonkar classifies them into functional categories. Data Transfer Instructions Accumulator (A): An 8-bit register that is part

AD0–AD7: Multiplexed address/data lines. This saves pins by using the same lines for the lower 8 bits of the address and the 8-bit data. A8–A15: Higher-order address lines. Control and Status Signals

The 8085 interfaces with EPROM (for program storage) and RAM (for temporary data). Decoders like the 74LS138 are often used to map specific addresses to these chips. I/O Interfacing Peripheral-Mapped I/O: Uses IN and OUT instructions. Memory-Mapped I/O: Treats I/O devices as memory locations. Why Gaonkar's Approach? Interrupts ALE (Address Latch Enable): Used to demultiplex

Program Counter (PC): A 16-bit register that points to the next instruction address.

RD and WR: Active low signals for reading and writing operations.