Microprocessor 8085 Ppt By Gaonkar New Jun 2026
Ramesh Gaonkar categorizes the 8085 instruction set into five functional domains based on the operations they execute. Data Transfer Instructions
The data's memory address is held inside a register pair (usually the HL pair).
A (e.g., Interrupts or I/O Interfacing). microprocessor 8085 ppt by gaonkar new
Requires external hardware (such as an Intel 8259 Interrupt Controller) to place a specific branching opcode or vector call address onto the data bus during the interrupt acknowledgment cycle ( INTA¯modified INTA with bar above Interrupt Management Instructions
The smallest unit of time, equal to one single period of the system clock frequency. Ramesh Gaonkar categorizes the 8085 instruction set into
The operand is hidden or implied directly within the command opcode.
+---v---+ X1 --|1 40|-- Vcc (+5V) X2 --|2 39|-- HOLD RESET OUT |3 38|-- HLDA SOD --|4 37|-- CLK (OUT) SID --|5 36|-- RESET IN TRAP --|6 35|-- READY RST 7.5 -|7 34|-- IO/M RST 6.5 -|8 33|-- S1 RST 5.5 -|9 32|-- RD INTR --|10 31|-- WR INTA --|11 30|-- ALE AD0 --|12 29|-- S0 AD1 --|13 28|-- A15 AD2 --|14 27|-- A14 AD3 --|15 26|-- A13 AD4 --|16 25|-- A12 AD5 --|17 24|-- A11 AD6 --|18 23|-- A10 AD7 --|19 22|-- A9 GND --|20 21|-- A8 +-------+ Multiplexed Address/Data Bus ( Requires external hardware (such as an Intel 8259
The 8085 microprocessor stands as a monumental milestone in the evolution of modern computing. Designed by Intel and introduced in 1976, this 8-bit processor became the bedrock of engineering education and industrial embedded systems. For students, educators, and professionals seeking comprehensive presentation materials on this architecture, the work of Ramesh Gaonkar serves as the definitive reference.
: Register Array, ALU (Arithmetic Logic Unit), and Instruction Decoder with Timing and Control circuitry. General Purpose : B, C, D, E, H, and L (8-bit each). Accumulator (A)
Set to 1 if a carry is generated from bit D3 to D4 during addition. Used for Binary Coded Decimal (BCD) arithmetic.
Interfacing Concepts (Memory-Mapped vs. Isolated I/O) Slide 14: Conclusion and Q&A Session
