How 8255 programmable peripheral interface can operate, Electrical Engineering

Assignment Help:

What are the different modes in which 8255 Programmable Peripheral Interface (PPI) can operate?

  • Twenty Four I/O lines in 38-bit port groups - A, B and C
  • A and B can be 8-bit input/output ports
  • C can serve as twenty four-bit input /output ports
  • 3 modes of operation:

- Mode 0: A, B, C simple input / output level sensitive ports

- Mode 1: A, B input / output ports along with strobe control in C

- Mode 2: A is bidirectional along with control/handshake in B and C

  • A, B can only modify 1 byte at a time
  • C has individual bit set/reset ability
  • Improvement is non-dedicated circuit can change port configuration along with software and no "glue logic"
  • Ports A, B and C are utilized for I/O data.
  • The control register is programmed to choose the operation mode of the three ports A, B and C.
  • Mode 0: simple I/O mode
  • Any of the ports A, B, CL and CU can be programmed as input / output.
  • No control of individual bits (all bits are out or in

Related Discussions:- How 8255 programmable peripheral interface can operate

Explain the construction of power transformer, Q. Explain, with the aid of ...

Q. Explain, with the aid of diagrams, the following in relation to the construction of power transformers. Include the advantages and disadvantages in your description. a) Core

Aggregate technical and commercial loss, Aggregate Technical and Commercial...

Aggregate Technical and Commercial Loss It is unfortunate in that addition to T&D losses, there is also a loss in revenue because of non-realisation of billed demand which lea

Expression for generated emf in a dc generator, Q.   Derive the expression ...

Q.   Derive the expression for generated emf in a dc generator. Ans. Expression for Generated emf in a DC Generator                We shall now derive an expre

Short note on types of enclosure of machine, Q.   Write a short note on typ...

Q.   Write a short note on types of enclosure of machine. Sol.       The various types of d.c. machine :              (1) Magnetic frame or Yoke              (2)

Transistor configurations, TRANSISTOR CONFIGURATIONS: Transistor circu...

TRANSISTOR CONFIGURATIONS: Transistor circuits may be categorized into three configurations based on which terminal is common to both of the input and output of circuit. Th

Relative permeability, The force between two wires 1 metre apart and each c...

The force between two wires 1 metre apart and each carrying 1 amp is 2 x 10 -7 Newtons when in a vacuum (or in practice, air).However, it is found experimentally that the force is

Explain p - type semiconductor, Explain p - Type semiconductor. p - ...

Explain p - Type semiconductor. p - Type semiconductor:- (i) If small amount of trivalent impurity is added with to a pure semiconductor giving a large no. of holes in t

What is an oscillator and show the advantages of oscillators, Q. What is an...

Q. What is an oscillator? Discuss the advantages of Oscillators ? An oscillator is a system consisting of active and passive circuit elements to produce a sinusoidal or other r

Metering technologies, Metering Technologies An electric meter or ener...

Metering Technologies An electric meter or energy meter is a device in which measures the amount of electrical energy supplied to customers of an electric supply company. Elec

Find the voltage, Q. The current sources in Figure are given to be I A = 3...

Q. The current sources in Figure are given to be I A = 30 A and I B = 50 A. For the values of R 1 = 20 ,R2 = 40 , and R3 = 80 , find: (a) The voltage V. (b) The current

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd