8085 Instruction Set Gaonkar File

They enable complex logic like loops and conditional execution by modifying the Program Counter (PC) . 5. Machine Control Operations

These instructions manage the state of the microprocessor itself.

Instructions like RLC (Rotate Left) and RRC (Rotate Right) shift bits within the accumulator, which is critical for serial data processing. 4. Branching Operations 8085 Instruction Set Gaonkar

Unlike data transfer, these instructions update the Flag Register (Carry, Zero, Sign, etc.) to reflect the result’s status. 3. Logic Operations

Gaonkar details that instructions vary in length based on their complexity: Only an opcode (e.g., MOV A, B ). 2-Byte: Opcode followed by 8-bit data (e.g., MVI A, 32H ). They enable complex logic like loops and conditional

ANA (Logical AND), ORA (Logical OR), XRA (Logical XOR), and CMP (Compare).

The Intel , as defined in the classic textbook by Ramesh S. Gaonkar , remains the gold standard for understanding microprocessor architecture. Gaonkar categorizes the 8085’s 74 fundamental instructions (represented by 246 opcodes ) into five logical groups, emphasizing the seamless integration of hardware and software. 1. Data Transfer Operations Instructions like RLC (Rotate Left) and RRC (Rotate

These perform bitwise manipulation, essential for masking and testing specific bits.