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

Determine the peak fundamental component of the mmf, Q. A two-pole, three-p...

Q. A two-pole, three-phase synchronous generator has a balanced three-phase winding with 15 turns per phase. If the three-phase currents are given by i a = 100 cos 377t, i b =

Electromagnetic torque, The torque produced by each conductor in the field ...

The torque produced by each conductor in the field will be:  where A is the area of the armature winding in the magnetic field, Ia is the current in armature winding, and B

Voltage and frequency control methods - motor control , Voltage  and Freq...

Voltage  and Frequency Control Methods In this  control  method the ratio of voltage  to frequency is kept constant so that the  flux  remains  constant. The voltage  at varia

Branch current method, if a resistor present in the middle of two branches ...

if a resistor present in the middle of two branches in such a way that their polarities coincide then how do we choose the polarity of that resistor

What do you mean by diversifiability of total risk, Q. What do you mean by ...

Q. What do you mean by diversifiability of total risk? Traditional finance theory assets that the rate of return on risk assets depends on the size of business risk, financial

Explain the working of a hartley oscillator, Q. With a neat circuit diagram...

Q. With a neat circuit diagram explain the working of a Hartley oscillator using an npn transistor and obtain the expression for oscillation frequency and for minimum gain for sust

What do you mean by nibble, Q. What do you mean by Nibble? The nibble i...

Q. What do you mean by Nibble? The nibble is a collection of bits on a 4-bit boundary. It would not be a particularly interesting data structure except for two items BCD (binar

Banking system , banking system is the collection of financial entities, in...

banking system is the collection of financial entities, infrastructure and practices which support financial transactions . system tech is a software system to handle their transa

In given block diagram find geq, Q. Show that the block diagram of Figure c...

Q. Show that the block diagram of Figure can be reduced to the form of Figure. Find G eq (s) and H eq (s).

What is a co-processor, What is a co-processor? 8087 NDP (numerical da...

What is a co-processor? 8087 NDP (numerical data processor) is also termed as math co-processor that is used in parallel with the major processor for number crunching applicat

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