Microprocessor 8085 Ppt By Gaonkar New __full__

The key features of the Intel 8085 microprocessor, often detailed in the standard textbook and presentations by Ramesh Gaonkar, include its architecture as an 8-bit general-purpose processor. It is widely used in academic curricula to teach the fundamentals of computer organization. Core Hardware Features 8-Bit Data Bus: It processes 8 bits of data at a time. 16-Bit Address Bus: This allows it to address up to ( 2162 to the 16th power ) of memory. Single Power Supply: It operates on a single DC power supply.

Clock Frequency: Typically operates at a maximum frequency of

, with an internal clock generator (it uses an external crystal of which is divided by 2 internally).

40-Pin DIP: It is housed in a 40-pin Dual In-line Package (DIP). Architecture & Registers microprocessor 8085 ppt by gaonkar new

Multiplexed Address/Data Bus: To save pins, the lower 8 bits of the address bus ( ) are multiplexed with the 8-bit data bus ( ), appearing as

Internal Registers: Includes an 8-bit Accumulator, six general-purpose 8-bit registers (B, C, D, E, H, L) which can be used in pairs (BC, DE, HL), a 16-bit Program Counter (PC), and a 16-bit Stack Pointer (SP).

Flag Register: Contains 5 status flags: Sign (S), Zero (Z), Auxiliary Carry (AC), Parity (P), and Carry (CY). Instruction & Interrupt System The key features of the Intel 8085 microprocessor,

Instruction Set: Features 74 operation codes (opcodes) and 246 instructions.

Addressing Modes: Uses five distinct modes—Immediate, Register, Direct, Indirect, and Implied.

Interrupts: Supports five hardware interrupts: TRAP (highest priority, non-maskable), RST 7.5, RST 6.5, RST 5.5, and INTR. Slide 1: Title Slide

Serial I/O: Includes Serial Input Data (SID) and Serial Output Data (SOD) lines for simple serial communication.

For further study, you can find comprehensive slide decks on platforms like SlideShare or academic repositories like NPTEL . Microprocessor 8085 complete | PPTX - Slideshare

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Slide 1: Title Slide

• Title: Architecture & Features of Intel 8085 Microprocessor
• Subtitle: Based on Gaonkar's Textbook Approach
• Content: Focus on hardware features, architecture, and signal groups.

What "New" Additions to Look For

If you find a PPT claiming to be "by Gaonkar new," check for these bonus slides that likely were added by modern educators updating the original material:

1. Microcontroller vs. Microprocessor comparison (Not originally in 8085 book, but added for context).
2. Introduction to Simulators (How to run 8085 code today without hardware).
3. Common University Viva Questions (List of 50+ questions asked in Mumbai, Pune, and VTU exams).
4. Stepper Motor & Traffic Light Interfacing (Practical applications Gaonkar mentions briefly, now expanded with circuit diagrams).

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Slide 9: Gaonkar's Key "Solid Feature" – The System Bus Concept

• Demultiplexing: External 8-bit latch (e.g., 74373) + ALE signal to separate A0–A7 from AD0–AD7.
• Control Bus: Combination of RD, WR, IO/M` to generate MEMR, MEMW, IOR, IOW.
• Result: 16-bit address bus + 8-bit data bus + control bus = complete system bus.
• This is the feature that makes 8085 connectable to RAM, ROM, and I/O chips.

9. Interrupts and DMA interaction

• Priority: TRAP highest (non-maskable), then RST7.5/6.5/5.5 (vectored), then INTR.
• DMA (DMA controller like 8257): HOLD/HLDA handshake to grant bus control to DMA; CPU tri-states bus during HOLD.

Warning on "Fake" PPTs

Avoid files named only 8085_ppt_final.pptx without author attribution. If the first slide does not cite "Reference: R.S. Gaonkar, Microprocessor Architecture...", move on. These fakes often contain incorrect timing diagrams (e.g., showing ALE active during T3, which is wrong; it is active only in T1).

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The Ultimate Guide to the Microprocessor 8085: Finding and Using the "New" Gaonkar PPT

Slide 8: Pin Description – Important Signals (Gaonkar's Hardware Focus)

• Multiplexed Bus: AD0–AD7 (lower address + data).
• Control Signals:
  • RD, WR: Read/Write memory or I/O.
  • IO/M`: Distinguishes I/O (1) vs Memory (0) operation.
  • ALE: Address Latch Enable (demultiplexes AD0–AD7).
• Status Signals: S0, S1 (identify machine cycles).
• DMA: HOLD/HLDA pins for direct memory access.

Slide 2: Introduction – The 8085 at a Glance (Gaonkar's Perspective)

• Key Feature: 8-bit microprocessor (processes 8 bits of data at a time).
• Technology: NMOS (N-channel Metal Oxide Semiconductor), single +5V power supply.
• Clock Speed: 3 MHz, 5 MHz, 6 MHz variants.
• Clock Generator: Internal clock generator (requires external crystal or LC tank circuit).
• Gaonkar's emphasis: The 8085 is a complete 8-bit computer on a single chip (CPU).