Microprocessor 8085 Ppt By Gaonkar Free [best]

Six 8-bit registers (B, C, D, E, H, L), often used in pairs (BC, DE, HL). Special Purpose: 16-bit Program Counter (PC) and Stack Pointer (SP). Instruction Set: Contains 74 instructions represented by 246 unique opcodes. Hardware Design:

One subdivision of an operation corresponding to one complete clock period. Anatomy of an Opcode Fetch Cycle ( M1cap M sub 1 An Opcode Fetch cycle typically requires 4 T-states: T1cap T sub 1 microprocessor 8085 ppt by gaonkar free

An 8-bit register containing 5 active flip-flops that reflect the status of the ALU after an operation: Set if the highest bit ( D7cap D sub 7 ) of the result is 1 (negative). Zero (Z): Set if the ALU operation result is exactly zero. Auxiliary Carry (AC): Set if there is a carry from bit D3cap D sub 3 D4cap D sub 4 . Used for BCD arithmetic. Six 8-bit registers (B, C, D, E, H,

State: The microprocessor reads the opcode from the data bus into its internal instruction register. RD¯modified cap R cap D with bar above returns high. T4cap T sub 4 Auxiliary Carry (AC): Set if there is a

The 8085 has five hardware interrupts: TRAP (highest priority), RST 7.5, RST 6.5, RST 5.5, INTR. 4. 8085 Instruction Set and Addressing Modes Gaonkar classifies 8085 instructions into five groups: Data Transfer Group: Moves data (e.g., MOV, MVI, LDA, STA). Arithmetic Group: Performs math (e.g., ADD, SUB, INR, DCR). Logical Group: Bit manipulation (e.g., ANA, ORA, XRA, CMP). Branching Group: Jumps and calls (e.g., JMP, CALL, RET). Machine Control Group: Affects CPU status (e.g., HLT, NOP). Addressing Modes refer to how the operand is specified: Immediate, Register, Direct, Indirect, and Implicit. 5. Finding "Microprocessor 8085 PPT by Gaonkar Free"