Architecture of 8085 Microprocessor V. Mahalakshmi



Download 3.52 Kb.
Date07.04.2021
Size3.52 Kb.

Architecture of 8085 Microprocessor

V.Mahalakshmi

TTS 3061

1154EC106- Basics of Embedded System

Features of 8085 Microprocessor

  • 8 bit general purpose microprocessor.
  • It has 40 pins (dip) dual in line package.
  • Capable of addressing 64K of memory.
  • It requires+5V power supply.
  • It can operate with 3Mhz clock.
  • It provides 74 instructions.
  • It has on chip clock generator.
  • 8-bit data bus.
  • 16-bit address bus, which can address upto 64KB.
  • A 16-bit program counter, stack pointer.

Pin Diagram

Architecture of 8085

Intel 8085 Microprocessor

Microprocessor consists of:

  • Control unit: control microprocessor operations.
  • ALU: performs data processing function.
  • Registers: provide storage internal to CPU.
  • Interrupts
  • Internal data bus, Address bus

Register sets of 8085

General Purpose Registers

  • B, C, D, E, H & L (8 bit regs)
  • Can be used singly or can be used as 16 bit register pairs BC, DE, HL.
  • H & L can be used as a data pointer (holds memory address)
  • Special Purpose Registers
  • Accumulator (8 bit register)

Accumulator:

Accumulator:

  • It is a 8-bit register which is used to perform arithmetical and logical operation.
  • It stores the output of any operation.
  • It also works as registers for i/o accesses.
  • Temporary Register

  • It is a 8-bit register which is used to hold the data on which the accumulator is computing operation.
  • It is also called as operand register because it provides operands to ALU.

Control signals of 8085

  • Arithmetic Latch Enable (ALE)
  • It is an output signal used to give information of AD0-AD7 contents. High – Address, Low - Data

    2.Read (RD) signal

    This is active low used for reading operation.

    3.Write signal (WR)

    This is active low used for writing operation.

Status signals


Download 3.52 Kb.

Share with your friends:




The database is protected by copyright ©ininet.org 2020
send message

    Main page