PPI 8255 Programmable I/O Device Quiz
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Questions and Answers

Which type of device is PPI 8255?

  • Power supply unit
  • Microprocessor
  • Memory unit
  • Programmable I/O device (correct)

How many 8-bit bidirectional I/O ports does PPI 8255 consist of?

  • Four
  • Three (correct)
  • Two
  • One

What is the function of Port C in PPI 8255?

  • It provides power supply to the device
  • It is used for memory storage
  • It acts as a control unit for the device
  • It is further divided into two 4-bit ports and can work in BSR mode or in mode 0 of input-output mode (correct)

How many control groups does PPI 8255 have?

<p>Two (control group A and control group B) (D)</p> Signup and view all the answers

Which value is used to select different ports in different modes as input-output functions or BSR in PPI 8255?

<p>CS’, A1, A0 (B)</p> Signup and view all the answers

What is the mode of operation of Port A in PPI 8255?

<p>Mode 0, mode 1, or mode 2 of input-output mode (A)</p> Signup and view all the answers

In which mode does the PPI 8255 work if the MSB of the control word (D7) is 0?

<p>Bit set reset (BSR) mode (C)</p> Signup and view all the answers

Which pin is used as the Reset input in PPI 8255?

<p>RESET (A)</p> Signup and view all the answers

What is the function of the A1 and A0 pins in PPI 8255?

<p>Address input (B)</p> Signup and view all the answers

Which mode of operation does PPI 8255 work in if the MSB of the control word (D7) is 1?

<p>Input-Output mode (A)</p> Signup and view all the answers

Which statement best describes the Handshake I/O mode of PPI 8255?

<p>Port A or Port B can work as simple input port or simple output port, and port C bits are used for handshake signals before actual data transmission. (D)</p> Signup and view all the answers

What is the main advantage of the PPI 8255 in terms of versatility?

<p>It operates in a variety of modes, making it a versatile component in many different systems. (A)</p> Signup and view all the answers

What is a disadvantage of the PPI 8255 in terms of functionality?

<p>It is not capable of high-speed data transfer. (A)</p> Signup and view all the answers

What does the PPI 8255 lack compared to newer I/O interface components?

<p>High-speed data transfer capability (B)</p> Signup and view all the answers

What makes the PPI 8255 an affordable option for many applications?

<p>Its relatively low-cost (A)</p> Signup and view all the answers

What type of signals are represented by physical variables and change smoothly over time?

<p>Analog signals (D)</p> Signup and view all the answers

Which devices commonly generate analog signals corresponding to the intensity of light in a scene?

<p>CCD and CMOS image sensors (B)</p> Signup and view all the answers

What type of signals can only take a finite set of values?

<p>Digital signals (C)</p> Signup and view all the answers

Which type of sensors commonly measure temperature and produce an analog voltage proportional to the measured temperature?

<p>Thermocouples and resistance temperature detectors (RTDs) (D)</p> Signup and view all the answers

What is the main advantage of digital signals over analog signals?

<p>They are less susceptible to noise and signal degradation (C)</p> Signup and view all the answers

What is the role of DACs in embedded systems?

<p>Converting digital signals into analog signals for actuators and analog instruments (A)</p> Signup and view all the answers

What is the function of ADCs in the context of analog and digital signals?

<p>Sampling the input signal at a specified rate and quantizing the sample value into a finite set of discrete values (A)</p> Signup and view all the answers

In what way do digital signals contribute to efficiency in processing?

<p>They can be processed and manipulated more efficiently using digital logic circuits (C)</p> Signup and view all the answers

What characterizes embedded systems in smart homes?

<p>They generate and process both analog and digital signals to control lighting, heating, and security systems (C)</p> Signup and view all the answers

What makes digital signals more resilient compared to analog signals?

<p>Their discrete nature makes them less susceptible to noise, crosstalk, and signal degradation (D)</p> Signup and view all the answers

Study Notes

PPI 8255

  • PPI 8255 is a Programmable Peripheral Interface (PPI) device.
  • It consists of three 8-bit bidirectional I/O ports: Port A, Port B, and Port C.

Port C

  • Port C is used for control and status operations.

Control Groups

  • PPI 8255 has two control groups.

Port Selection

  • The value of the control word (D7-D0) is used to select different ports in different modes as input-output functions or BSR (Bit Set Reset) in PPI 8255.

Mode of Operation

  • Port A operates in I/O mode or BSR mode.
  • If the MSB of the control word (D7) is 0, PPI 8255 works in I/O mode.
  • If the MSB of the control word (D7) is 1, PPI 8255 works in BSR mode.

Reset Input

  • The Reset input is connected to pin 36 (Reset).

Address Lines

  • A1 and A0 pins are used as address lines to select different modes.

Handshake I/O Mode

  • In Handshake I/O mode, PPI 8255 can perform input/output operations with a handshake protocol.

Advantages and Disadvantages

  • The main advantage of PPI 8255 is its versatility.
  • A disadvantage of PPI 8255 is its limited functionality.
  • PPI 8255 lacks the capabilities of newer I/O interface components.

Cost Effectiveness

  • PPI 8255 is an affordable option for many applications due to its low cost.

Signal Types

  • Analog signals are represented by physical variables and change smoothly over time.
  • Analog signals are commonly generated by devices such as light sensors, which measure the intensity of light in a scene.
  • Digital signals can only take a finite set of values.

Analog and Digital Signals

  • Analog signals are converted to digital signals using Analog-to-Digital Converters (ADCs).
  • Digital signals are converted to analog signals using Digital-to-Analog Converters (DACs).
  • The main advantage of digital signals over analog signals is their resistance to noise and interference.
  • Digital signals contribute to efficiency in processing by allowing for fast and accurate processing.

Embedded Systems

  • Embedded systems in smart homes are characterized by the use of digital signals.
  • Digital signals are more resilient compared to analog signals due to their ability to withstand noise and interference.

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Description

Test your knowledge about the PPI 8255, a versatile programmable I/O device used to interface microprocessors with external components such as ADC, DAC, and keyboards. This quiz covers its features, programming, and applications.

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