Assembly language instructions, Electrical Engineering

ASSEMBLY LANGUAGE INSTRUCTIONS

Machine  language  and assembly  language are already been  discussed in chapter 1. In this chapter  we will discuss  various instructions of 8085 microprocessor  in detail.  Microprocessor  is a programmable  digital circuit comprises of registers flip flop  counters etc. An instruction is a binary pattern  which when  applied  to the microprocessor a specific  task is  performed. The  entire group of instructions  of particular microprocessor  is called  its instruction set. Each microprocessor has its own instruction set. The  instruction of 8085 microprocessor will  not  execute on other  microprocessor. In 8085 microprocessor each  instruction  code is  of 8 bit  hence there  may 28. (= 256) different  binary  patterns  therefore  total 256 instructions and 74  different types  of instruction in its instructions set.

Each  instruction has two  part the opcode and the operand. The opcode defines the  operation to be  performed  and operand specifies the data  on which  the operation is to be  performed.  The operand can be 8/ 16 bit data  memory  location  or register. Some  instruction s may have  one operand some have two   operands and some  do not  have any  operand.  Various  types of instruction formats  are discussed later  in this chapter.

According  to the  size  the instructions may  be of one byte  two byte  or three  byte according  they  require one  two or  three  memory  locations. Later in this  chapter we will  see the  size of various  type of  instructions and how  to identify them.

Posted Date: 4/4/2013 3:52:15 AM | Location : United States







Related Discussions:- Assembly language instructions, Assignment Help, Ask Question on Assembly language instructions, Get Answer, Expert's Help, Assembly language instructions Discussions

Write discussion on Assembly language instructions
Your posts are moderated
Related Questions
Level 1 is means of sending bit streams over a physical path. It uses times lot 16 of a 2 M bit/s PCM system or times slot 24 of a1.5 M bit/s system. Level 2 performs functions

The voltage across a 1 - μF capacitor is given. Which is the sinusoidal expression for the current? a) 30 sin200t b) 70cos (800t - 20°) At what frequency will the re

Determine the shaft power output: A 6-pole, 50 Hz, 3-phase induction motor running on full load develops a useful torque of 180 Nm when the rotor emf frequency is 2 Hz. Determ

design and sketch an optimal circuit that takes a 4 bit number and generates an 8 bit output equal to the square of the input

Q. Show Frequency response using pspice and probe? PSpice is capable of performing transient circuit analysis, for which the request is given by the following statement: • T

What are procedures? Procedures are a group of instructions stored as a separate program in memory and it is known from the main program whenever needed. The type of procedure


Q. What do you mean by Instrument transformers? These are generally of two types, potential transformers (PTs) and current transformers (CTs). They are designed in such a way t

Performance Equations of Three Phase Induction Motor When balanced 3-? voltages are applied to the  stator  winding  a rotating magnetic field  of constant amplitude is produc

Q. A four-pole dc machine with 728 active conductors and 30mWb flux per pole runs at 1800 r/min. (a) If the armature winding is lap wound, find the voltage induced in the armatu