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

Provide definition of signals, Provide Definition of Signals A continuo...

Provide Definition of Signals A continuous-time signal x(t) is a signal that is a function of real number t. For a discrete-time signal x[n], it is a method of discrete time in

Major advantages of fet transistors over bjt transistors, Q. What the major...

Q. What the major advantages FET transistors over BJT transistors? a. BJT transistor (bipolar junction transistor) is a bipolar device - the prefix bi-revealing that the conduc

Fraction of the total cross section - interaction processes, Determine and ...

Determine and plot for 5 keV to 100 MeV the fraction of the total cross section due to each of the four interaction processes for      (a) hydrogen,      (b) nitrogen,

Find the initial current, In the circuit shown below, the capacitor initial...

In the circuit shown below, the capacitor initially has a voltage across it 4 Volts (at t = 0). a.  Write down the expression for V C (t) when the switch is closed. b.  Writ

Silicon Photonics, How does a Mach-Zehnder Modulator work in Silicon?

How does a Mach-Zehnder Modulator work in Silicon?

Carry flag - registers, Carry Fla Registers  The  size  of the accumul...

Carry Fla Registers  The  size  of the accumulator is of 8 bit  if after  any arithmetical  or logical  operation 9 th   bit is generated i e  there is  carry beyond  D 7   bi

Name the materials used in case of fuses, Name the materials used in case...

Name the materials used in case of Fuses . Also give reasons. Fuses : For rewirable fuses, copper-tin and lead-tin alloy is used. For HRC and cartridge fuses silve

Explain lithography, Explain Lithography. Lithography - This is one ...

Explain Lithography. Lithography - This is one of the processes which is carried out throughout manufacture of integrated circuits. Silica oxide (SiO 2 ) layer is thermally

Semiconductors, Charge density In a semiconductor

Charge density In a semiconductor

Computes similarity between two histograms, Write an m-file "distan.m"  whi...

Write an m-file "distan.m"  which does all the following operations: (i) computes 10 dimensional histogram of an input image             h1=sum(hist(imn,10)'); (ii) computes

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