Set if the most significant bit (D7) of the result is 1 (negative number). Zero (Z): Set if the ALU operation results in exactly zero.
These perform addition, subtraction, increment, and decrement. Add register to accumulator. SUB: Subtract register from accumulator. INR/DCR: Increment or decrement register by 1. Logical Instructions These perform Boolean operations and bit shifts. ANA: Logical AND with accumulator. ORA: Logical OR with accumulator. CMP: Compare register with accumulator. Branching Instructions
LDA 2050H (Load the contents of memory address 2050H directly into the Accumulator) 2. Arithmetic Operations
: Use Gaonkar's clear terminology like "Microprocessing Unit (MPU)" instead of just "CPU" to match standard examination vocabularies. microprocessor 8085 ppt by gaonkar new
The high ALE signal enables an external 8-bit latch latch (e.g., 74LS373) to store these address lines.
TRAP, RST 7.5, 6.5, 5.5, INTR, INTA.
For the next six hours, the team didn't sleep. They didn't copy-paste. They translated. Set if the most significant bit (D7) of
Addressing Modes (Immediate, Direct, Register, Register Indirect, Implicit)
Performs operations like Addition, Subtraction, AND, OR, XOR, Comparison, Increment, and Decrement.
Alters the program execution flow conditionally or unconditionally. JMP 2000H , JC 3000H , CALL 4000H , RET Controls internal operations and interrupt status. EI , DI , SIM , RIM , NOP , HLT Memory and I/O Interfacing Add register to accumulator
KB of memory. Introduced in the late 1970s, it is known for its simplicity and reliability, making it an excellent starting point for understanding microprocessor operations. NMOS Clock Speed: Power Supply: +5positive 5 Package: 40-pin IC 2. Internal Architecture of 8085 (Gaonkar's Perspective)
Performs addition, subtraction, logical AND, OR, XOR, complement, and shifting.
Microprocessor 8085 PPT by Gaonkar New: A Comprehensive Guide to Architecture and Programming
The 8085 features a matrix of registers accessible to the programmer:
The processor uses an independent address space specifically reserved for peripherals ( distinct input and