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

Guarding Against Loss in Transformers, Guarding Against Loss in Transformer...

Guarding Against Loss in Transformers Distribution transformers are expected to convert up to 95-98% of the input power into usable output power. A distribution transformers i

Determine flux in the central limb, Determine flux in the central limb: ...

Determine flux in the central limb: For the magnetic circuit shown in Figure the value of flux in the right limb is 0.48 m Wb and the number of turns wound on the central limb

Show noise and stability of operational amplifier, Q. Show Noise and Stabil...

Q. Show Noise and Stability of operational amplifier? Noise This refers to the small, rapidly varying, random spurious signals generated by all electronic circuits. Noise

Find in wavelengths how long the line, Q. A transmission line with air diel...

Q. A transmission line with air dielectric is 25 m long. Find, in wavelengths, how long the line is at frequencies of 1 kHz, 10 MHz, and 100 MHz.

First generation 1946- 1654 - history of computer, First Generation (1946- ...

First Generation (1946- 1654) In the  first  generation computer  vacuum tubes and valves were used. These computer were very large in size ( thousands of square feet on the fl

Explain the working of asynchronous (ripple) counters, Explain the Working ...

Explain the Working of Asynchronous (Ripple) Counters? An external clock is connected to the clock input of the first flip-flop (FF0) only. Thus FF0 changes state at the falli

Explain the construction and working of calomel electrode , 1.  Explain the...

1.  Explain the construction and working of Calomel electrode 2.  Derive an expression for the electrode potential of a glass electrode. 3.  What are ion selective electrodes

Find the directive gain, Q. Aconical horn has a side viewas shown in Figure...

Q. Aconical horn has a side viewas shown in Figure  The maximum value ofthe directive gain is given by GD ∼ = 5.13(D/λ) 2 , where D =√3.33λL1 and L1 = L/(1-d/D),in which d is the i

L filters, L filters: An L filter contains two reactive elements that ...

L filters: An L filter contains two reactive elements that are one in series and one in parallel. T and π filters: Main article: Capacitor-input filter

Find the current through each resistor, For the circuit in figure, find the...

For the circuit in figure, find the current through each resistor.

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