Microprocessor 8085 Ppt By Gaonkar Jun 2026

Controls the status of the processor or manages specific operational states. NOP (No Operation; wastes 4 T-states for timing delays) HLT (Halt CPU operations until an interrupt occurs) 6. Interrupt Structure

Fabricated using NMOS (Negative-channel Metal-Oxide Semiconductor) technology.

| Internal Block | Function | |:---|:---| | | Performs all the arithmetic (addition, subtraction) and logical (AND, OR, XOR) operations on data. | | Register Array | A set of general-purpose registers (B, C, D, E, H, L) used as temporary storage for data during program execution. | | Accumulator (A) | The primary register where one operand is placed for ALU operations and where the result is stored. | | Flag Register | An 8-bit register with five 1-bit flags (Sign, Zero, Auxiliary Carry, Parity, Carry) that indicate the status of the last ALU operation, used for making decisions in a program. | | Program Counter (PC) | A 16-bit register that always holds the address of the next instruction to be executed. | | Stack Pointer (SP) | A 16-bit register that points to the top of a stack in memory, used for temporarily storing data or return addresses. | | Timing and Control Unit | Acts as the brain's pacemaker, generating the necessary control signals to synchronize all operations and fetch-execute cycles. | | Instruction Register and Decoder | Holds the current instruction being executed and decodes it to determine the operation to be performed. | microprocessor 8085 ppt by gaonkar

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Alters the normal linear sequence of a program conditionally or unconditionally (e.g., JMP , JC , CALL , RET ). Controls the status of the processor or manages

The transition from the Intel 8080 to the enhanced 8085 (the "5" signifies a single +5V power supply).

The Intel 8085 is a foundational 8-bit microprocessor introduced by Intel in 1976. For decades, it has served as the bedrock of embedded systems education globally. When students, educators, and engineers seek to master or teach this architecture, one name stands out: Ramesh Gaonkar. His textbook, "Microprocessor Architecture, Programming, and Applications with the 8085," is considered the definitive authority on the subject. | Internal Block | Function | |:---|:---| |

Gaonkar breaks down the 8085 architecture into three main components: the Register Array, the Arithmetic and Logic Unit (ALU), and the Timing and Control Unit. 2.1 The Register Array

ANA B (Perform a bitwise logical AND between register B and the Accumulator)

The operand is hidden in the opcode (e.g., CMA ). 4.2 Instruction Categories Data Transfer: MOV , MVI , LDA , STA , LXI . Arithmetic: ADD , SUB , INR , DCR . Logical: ANA , ORA , XRA , CMP . Branching: JMP , JZ , CALL , RET . Machine Control: HLT , NOP , SIM , RIM . 5. Memory and I/O Interfacing

) operations. It relies on the accumulator to store intermediate results. 2.3 Timing and Control Unit