8155 I/O Ports in Handshake Mode
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Questions and Answers

What is the first step in the given process?

  • Send the SOC command to the ADC
  • Configure the 8155 I/O ports
  • Draw the design (correct)
  • Assign the I/O port addresses

    • What is the control word value for the 8155 I/O port configuration?

  • 00h
  • 20h
  • 13h
  • 0Ah (correct)

    • Where is the address of the 8155 control register located?

  • 13h
  • 00h
  • 20h
  • 10h (correct)

    • Which port pin of Port C is the SOC input of the ADC connected to?

    <p>PC5</p> Signup and view all the answers

    What is the purpose of the BF signal in the 8155-ADC communication?

    <p>To enable the ADC output buffer</p> Signup and view all the answers

    How does the 8085 know when the data is ready to be read from the ADC?

    <p>By checking the BF signal</p> Signup and view all the answers

    What is the function of the STB signal in the handshake mode for port A of the 8155?

    <p>Input handshake signal from peripheral to 8155</p> Signup and view all the answers

    Which signals from port C are used by port B when configured in the handshake mode?

    <p>PC3, PC4, PC5</p> Signup and view all the answers

    What does the BF signal indicate in the handshake mode of the 8155?

    <p>Presence of the data byte in the port</p> Signup and view all the answers

    How can a 3 to 8 decoder be used in interfacing with the 8155?

    <p>To assign I/O port addresses</p> Signup and view all the answers

    What is differentiated by the RD and WR signals in the control register & Status register of the 8155?

    <p>Control and data transfer directions</p> Signup and view all the answers

    How does the INTR signal function in interfacing between the 8155 and 8085 microprocessor?

    <p>Interrupting the 8085 microprocessor</p> Signup and view all the answers

    How many address lines are needed to decode the control register and I/O ports of the 8155 microprocessor?

    <p>3</p> Signup and view all the answers

    In the 8205 decoder, which enables need to be active to enable the decoder?

    <p>E1 and E3 low, E2 high</p> Signup and view all the answers

    Which component is responsible for interfacing the 8155 microprocessor with the 8085?

    <p>Programmable Peripheral Interface</p> Signup and view all the answers

    What type of commands can be given to the 8155 microprocessor for configuration?

    <p>All of the above</p> Signup and view all the answers

    Where are the commands for the 8155 microprocessor stored?

    <p>Control Register</p> Signup and view all the answers

    What is another term used for a command or instruction given to the 8155 microprocessor?

    <p>Control Word</p> Signup and view all the answers

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