Podcast
Questions and Answers
What is the purpose of the LHLD instruction in the 8085 assembly language?
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?
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?
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?
What distinguishes memory-mapped I/O from I/O-mapped I/O in interfacing with external devices using the 8085 microprocessor?
What does the SHLD instruction do in the 8085 microprocessor?
What does the SHLD instruction do in the 8085 microprocessor?
How many interrupt request lines are available in the 8259 Programmable Interrupt Controller?
How many interrupt request lines are available in the 8259 Programmable Interrupt Controller?
What is the primary function of the Control Word Register (CWR) in the 8255 Programmable Peripheral Interface (PPI)?
What is the primary function of the Control Word Register (CWR) in the 8255 Programmable Peripheral Interface (PPI)?
When using the 8255 Programmable Peripheral Interface (PPI) for I/O operations, what additional effort is required compared to dedicated I/O chips?
When using the 8255 Programmable Peripheral Interface (PPI) for I/O operations, what additional effort is required compared to dedicated I/O chips?
Which component in the 8085 microprocessor is used for signaling an interrupt request?
Which component in the 8085 microprocessor is used for signaling an interrupt request?
In the 8259 Programmable Interrupt Controller (PIC), what is the main function of the OCW2 register?
In the 8259 Programmable Interrupt Controller (PIC), what is the main function of the OCW2 register?
If an instruction 'SHLD 3000H' is used in 8085 assembly language, which addressing mode is being implemented?
If an instruction 'SHLD 3000H' is used in 8085 assembly language, which addressing mode is being implemented?
Which pin on the 8085 microprocessor is responsible for carrying the low-order address bits?
Which pin on the 8085 microprocessor is responsible for carrying the low-order address bits?
What distinguishes the 8255 PPI in terms of I/O operations compared to dedicated I/O chips?
What distinguishes the 8255 PPI in terms of I/O operations compared to dedicated I/O chips?
In the 8085 microprocessor, what signal indicates the start of the machine cycle?
In the 8085 microprocessor, what signal indicates the start of the machine cycle?
Which instruction in the 8085 assembly language is used to load data from a memory location to the accumulator?
Which instruction in the 8085 assembly language is used to load data from a memory location to the accumulator?
What is the primary function of the Stack Pointer (SP) register in the 8085 microprocessor?
What is the primary function of the Stack Pointer (SP) register in the 8085 microprocessor?
How many bits wide is the data bus in the 8085 microprocessor?
How many bits wide is the data bus in the 8085 microprocessor?
What does the RD signal indicate in the 8085 microprocessor?
What does the RD signal indicate in the 8085 microprocessor?
What does the ALE pin in the 8085 microprocessor indicate?
What does the ALE pin in the 8085 microprocessor indicate?
Which instruction in 8085 assembly language is used to copy the content of one register into another?
Which instruction in 8085 assembly language is used to copy the content of one register into another?
What role does the WR pin play in the 8085 microprocessor?
What role does the WR pin play in the 8085 microprocessor?
What is the function of the LXI instruction in 8085 assembly language?
What is the function of the LXI instruction in 8085 assembly language?
Where does the Stack Pointer (SP) register point to in the memory of the 8085 microprocessor?
Where does the Stack Pointer (SP) register point to in the memory of the 8085 microprocessor?
When implementing a subroutine in 8085 assembly language, which register is typically used for storing the return address?
When implementing a subroutine in 8085 assembly language, which register is typically used for storing the return address?
What is the primary purpose of the 8259 Programmable Interrupt Controller (PIC)?
What is the primary purpose of the 8259 Programmable Interrupt Controller (PIC)?
What is a disadvantage of using the 8259 Programmable Interrupt Controller (PIC) for interrupt handling?
What is a disadvantage of using the 8259 Programmable Interrupt Controller (PIC) for interrupt handling?
Which pin on the 8085 microprocessor is specifically used for the interrupt acknowledge signal?
Which pin on the 8085 microprocessor is specifically used for the interrupt acknowledge signal?
In the 8259 Programmable Interrupt Controller (PIC), what does the INTA signal indicate?
In the 8259 Programmable Interrupt Controller (PIC), what does the INTA signal indicate?
Which addressing mode is utilized in the 'XCHG' instruction in 8085 assembly language?
Which addressing mode is utilized in the 'XCHG' instruction in 8085 assembly language?
What is the role of the Data Bus Buffer Register (DBBR) in the 8255 Programmable Peripheral Interface (PPI)?
What is the role of the Data Bus Buffer Register (DBBR) in the 8255 Programmable Peripheral Interface (PPI)?
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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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.
