Basic operations of 8085 microprocessor , Electrical Engineering

Basic Operations of 8085 Microprocessor

The 8085 microprocessor  performs followings  five  basic  operations .

1. Opcode Fetch :  Reading and decoding  operation code  of n instruction.

2. Memory Read: Reading data  from  memory.

3. Memory Write : Writing data  into  memory.

4. I. O Read: Accepting  data from  input  port.

5. I/ O  Write : Sending data  to output  port.

These  operations  will be  discussed in detail  with their  timing diagrams in  chapter6.

Here  only memory  read  operation is explained   to show  how  different  busses  are used  together  to perform  such  operations.

Suppose  data byte  stored  at location 2010H   is to be  read in  memory  read  operation  followings  steps are followed  to perform  this operations:

1. The 16 bit  memory  address is placed  on the 16bit  address bus by the microprocessor.

2. The address is decoded by  the memory  decoder  and the  desired  memory  location is selected.

3. For  reading  the data  from this  location  a RD signal  is generated by  the control  unit  of the  microprocessor  which  enables  the memory  chip.

4. The data  byte  from the  memory  location  is placed  on the  data bus.

5. Through  data bus data  byte is brought  into the  microprocessor  register.

Posted Date: 4/4/2013 3:14:24 AM | Location : United States







Related Discussions:- Basic operations of 8085 microprocessor , Assignment Help, Ask Question on Basic operations of 8085 microprocessor , Get Answer, Expert's Help, Basic operations of 8085 microprocessor Discussions

Write discussion on Basic operations of 8085 microprocessor
Your posts are moderated
Related Questions
Q. A 10-turn square coil of side 200 mm is mounted on a cylinder 200 mm in diameter. If the cylinder rotates at 1800 r/min in a uniform 1.2-T field, determine the maximum value of

Q. Calculate the stator input current? The parameters of the equivalent circuit shown in Figure for a three-phase, wye-connected, 220-V, 10-hp, 60-Hz, six-pole induction motor

Draw the memory map of TPA in a personal computer and explain different areas. The transient program area holds the DOS operating system and other programs which control the co

Draw the hysteresis loop for a soft magnetic material and compare it with the hysteresis loop of hard magnetic material. Give two examples of each. Soft and hard magnetic mate


Q. A three-phase, 50-Hz induction motor has a full load speed of 700 r/min and a no-load speed of 740 r/min. (a) How many poles does the machine have? (b) Find the slip and t

DPR PREPARATION: 1.  Asset Management 2.  System Operations and Despatch 3.  Field Operations 4.  Customer Processes 5.  Corporate Processes The details covered

Discuss the following points with regard to the Company selecting Jebel Ali Free Zone as its Middle East base.  (a) How is a company likely to enhance its supply chain by using

Q. A charge q(t) = 50 + 1.0t C flows into an electric component. Find the current flow.

Explain the effect of a dielectric on the behaviour of a capacitor. If two parallel plates are separated by a distance 'd' (meters) in vacuum and are kept at a potential diffe