LHLD Instruction in 8085 Microprocessor Quiz

Podcast Beta

Play an AI-generated podcast conversation about this lesson

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

INTR (correct)

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

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

What does the SHLD instruction do in the 8085 microprocessor?

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

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

8 Signup and view all the answers

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

To configure the operating modes and I/O directions 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?

It demands extra programming effort Signup and view all the answers

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

HOLD Signup and view all the answers

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

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

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

Memory direct Signup and view all the answers

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

AD0-AD7 Signup and view all the answers

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

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

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

Address 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?

LDA Signup and view all the answers

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

To manage the memory stack for subroutine calls and returns Signup and view all the answers

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

8 Signup and view all the answers

What does the RD signal indicate in the 8085 microprocessor?

Memory read operation Signup and view all the answers

What does the ALE pin in the 8085 microprocessor indicate?

Address Signup and view all the answers

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

LXI Signup and view all the answers

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

Write operation signal Signup and view all the answers

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

Load accumulator indirect Signup and view all the answers

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

Input/output ports Signup and view all the answers

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

Program Counter (PC) register Signup and view all the answers

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

To configure the operating modes and interrupt priorities Signup and view all the answers

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

Introduces additional hardware complexity Signup and view all the answers

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

INTR Signup and view all the answers

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

The start of an interrupt acknowledge cycle Signup and view all the answers

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

Register direct Signup and view all the answers

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

Facilitating data transfer between devices and buses 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.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

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.

8085 Microprocessor Quiz