8085 Microprocessor Quiz
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Questions and Answers

What is the purpose of the LHLD instruction in the 8085 assembly language?

  • It loads the HL register pair with a memory address (correct)
  • It performs an indirect memory load operation
  • It stores the contents of the accumulator to a memory location
  • It loads the accumulator with a direct value

    • In the 8259 Programmable Interrupt Controller, what is the role of the interrupt request lines?

  • To request CPU intervention for handling interrupts (correct)
  • To indicate the priority of interrupts
  • To synchronize communication between peripherals
  • To generate clock signals for the processor

    • Which pin in the 8085 microprocessor is responsible for controlling interrupt operations?

  • TRAP
  • A16
  • S0
  • INTR (correct)

    • What distinguishes memory-mapped I/O from I/O-mapped I/O in interfacing with external devices using the 8085 microprocessor?

    <p>I/O-mapped I/O treats I/O devices as memory locations</p> Signup and view all the answers

    What does the SHLD instruction do in the 8085 microprocessor?

    <p>Stores data from a specified memory address to HL register pair</p> Signup and view all the answers

    How many interrupt request lines are available in the 8259 Programmable Interrupt Controller?

    <p>8</p> Signup and view all the answers

    What is the primary function of the Control Word Register (CWR) in the 8255 Programmable Peripheral Interface (PPI)?

    <p>To configure the operating modes and I/O directions</p> Signup and view all the answers

    When using the 8255 Programmable Peripheral Interface (PPI) for I/O operations, what additional effort is required compared to dedicated I/O chips?

    <p>It demands extra programming effort</p> Signup and view all the answers

    Which component in the 8085 microprocessor is used for signaling an interrupt request?

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

    In the 8259 Programmable Interrupt Controller (PIC), what is the main function of the OCW2 register?

    <p>To mask/unmask interrupt sources</p> Signup and view all the answers

    If an instruction 'SHLD 3000H' is used in 8085 assembly language, which addressing mode is being implemented?

    <p>Memory direct</p> Signup and view all the answers

    Which pin on the 8085 microprocessor is responsible for carrying the low-order address bits?

    <p>AD0-AD7</p> Signup and view all the answers

    What distinguishes the 8255 PPI in terms of I/O operations compared to dedicated I/O chips?

    <p>Flexibility in configuring I/O ports and operation modes</p> Signup and view all the answers

    In the 8085 microprocessor, what signal indicates the start of the machine cycle?

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

    Which instruction in the 8085 assembly language is used to load data from a memory location to the accumulator?

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

    What is the primary function of the Stack Pointer (SP) register in the 8085 microprocessor?

    <p>To manage the memory stack for subroutine calls and returns</p> Signup and view all the answers

    How many bits wide is the data bus in the 8085 microprocessor?

    <p>8</p> Signup and view all the answers

    What does the RD signal indicate in the 8085 microprocessor?

    <p>Memory read operation</p> Signup and view all the answers

    What does the ALE pin in the 8085 microprocessor indicate?

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

    Which instruction in 8085 assembly language is used to copy the content of one register into another?

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

    What role does the WR pin play in the 8085 microprocessor?

    <p>Write operation signal</p> Signup and view all the answers

    What is the function of the LXI instruction in 8085 assembly language?

    <p>Load accumulator indirect</p> Signup and view all the answers

    Where does the Stack Pointer (SP) register point to in the memory of the 8085 microprocessor?

    <p>Input/output ports</p> Signup and view all the answers

    When implementing a subroutine in 8085 assembly language, which register is typically used for storing the return address?

    <p>Program Counter (PC) register</p> Signup and view all the answers

    What is the primary purpose of the 8259 Programmable Interrupt Controller (PIC)?

    <p>To configure the operating modes and interrupt priorities</p> Signup and view all the answers

    What is a disadvantage of using the 8259 Programmable Interrupt Controller (PIC) for interrupt handling?

    <p>Introduces additional hardware complexity</p> Signup and view all the answers

    Which pin on the 8085 microprocessor is specifically used for the interrupt acknowledge signal?

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

    In the 8259 Programmable Interrupt Controller (PIC), what does the INTA signal indicate?

    <p>The start of an interrupt acknowledge cycle</p> Signup and view all the answers

    Which addressing mode is utilized in the 'XCHG' instruction in 8085 assembly language?

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

    What is the role of the Data Bus Buffer Register (DBBR) in the 8255 Programmable Peripheral Interface (PPI)?

    <p>Facilitating data transfer between devices and buses</p> Signup and view all the answers

    Study Notes

    8085 Microprocessor

    • The RD pin is responsible for indicating the start of a memory read operation.
    • The Clock signal indicates the start of a machine cycle in the timing diagram.
    • The MVI instruction is used to load the 8-bit immediate data into the accumulator in 8085 assembly language.

    Stack Pointer (SP) Register

    • The Stack Pointer (SP) register is used to manage the memory stack for subroutine calls and returns.

    Assembly Language Programming

    • A program can be developed to count the number of even numbers in an array of 8-bit numbers using the 8085 microprocessor.
    • The STA instruction is used to transfer the contents of the accumulator to the memory location pointed by the HL register pair.

    Programmable Interrupt Controller (PIC)

    • The 8259 PIC has 8 interrupt request lines available.
    • The OCW2 register in the 8259 PIC is used to mask/unmask interrupt sources.

    Input/Output Operations

    • The IO/M pin indicates whether the CPU is accessing memory or I/O devices.
    • Memory-mapped I/O simplifies programming but can lead to contention for memory access between the CPU and I/O devices.
    • I/O-mapped I/O separates the address space for memory and I/O, reducing contention but requiring additional instructions for I/O operations.

    8255 Programmable Peripheral Interface (PPI)

    • The 8255 PPI has 4 ports available.
    • The Control Word Register (CWR) configures the operating modes and I/O directions.

    Interrupt Handling

    • The HOLD pin is used for the interrupt request signal.
    • The INTR pin is used for the interrupt acknowledge signal.
    • The 8259 PIC provides prioritized interrupt handling and allows for efficient management of interrupt sources.

    Addressing Modes

    • The instruction "LHLD 3000H" uses the memory direct addressing mode.
    • The instruction "SHLD 3000H" uses the memory direct addressing mode.
    • The instruction "XCHG" uses the register direct addressing mode.

    Miscellaneous

    • The A15-A8 pins carry the high-order address bits.
    • The Control signal indicates the end of a machine cycle in the timing diagram.
    • The Program Counter (PC) register holds the address of the next instruction to be executed.
    • The Data Bus Buffer Register (DBBR) is used in the 8255 PPI.

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    Test your knowledge about the 8085 microprocessor with questions on high-order address bits, machine cycle timing diagram, and instructions in assembly language. Check your understanding of key concepts and signals in the 8085 microprocessor architecture.

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