Sage-Tips

What is the function of intr in 8085?

INTR. It is a maskable interrupt, having the lowest priority among all interrupts. It can be disabled by resetting the microprocessor. The microprocessor checks the status of INTR signal during the execution of each instruction.

What is the purpose of intr?

INTR. The INTR is a maskable interrupt because the microprocessor will be interrupted only if interrupts are enabled using set interrupt flag instruction. It should not be enabled using clear interrupt Flag instruction. The INTR interrupt is activated by an I/O port.

What is the difference between intr and other vectored interrupts of 8085?

An INTR interrupt will always get the address of a subroutine from the device ( external ) itself. In the case of other hardware interrupts the interrupts come from the call generated by the processor at a already determined vector location.

What is the function of INTA signal?

Short for INTerrupt Acknowledge, INTA is a signal used to identify that a CPU has an interrupt made by the interrupt controller.

What will be the response of 8085 to intr?

INTR is the only non-vectored interrupt in the 8085 system. If the INTR signal is high, the microprocessor completes the execution of the current instruction, disables the interrupt, and then sends the INTA signal (Interrupt Acknowledgement) to the device, which has raised the interrupt.

What are the two major difference between intr and other interrupts?

Answer :The two major differences between INTR and the other hardware interrupts are as follows:All the hardware interrupts are vectored interrupts but the INTR interrupt is not so. An INTR interrupt will always get the address of a subroutine from the device ( external ) itself.

What is intr microprocessor?

Which of the following is a 16 bit register for 8085 microprocessor?

Stack Pointer
Stack Pointer: The stack pointer in the 8085 microprocessor is a 16-bit register that stores the address of the top of stack memory.

What is the importance of EI and DI instructions in 8085 interrupt handling process?

It is a 1-Byte instruction. When this instruction is executed, the IE flip-flop is reset. This disables the 8085 interrupt system except for the TRAP pin. When the 8085 recognizes an interrupt, it branches to an ISS (Interrupt Service Subroutine)….EI and DI instructions in 8085.

Mnemonics, Operand	Opcode(in HEX)	Bytes
EI	FB	1
DI	F3	1

Does the 8085 support externally initiated operations if yes how?

Yes the 8085 does support several externally initiated operations. The possible operations and the corresponding pins for them in the 8085 are as follows: – It supports resetting ( this is possible with the Reset Pin ).