Sage-Tips

Which is maskable interrupt?

Maskable Interrupts are those which can be disabled or ignored by the microprocessor. These interrupts are either edge-triggered or level-triggered, so they can be disabled. INTR, RST 7.5, RST 6.5, RST 5.5 are maskable interrupts in 8085 microprocessor.

What is the advantage of interrupt based data transfer?

In interrupt driven data transfer, whenever I/O device is ready for the data transfer, it will interrupt the CPU. In the ISR, the CPU will perform the data transfer. This method is better than polling because here the CPU does not have to waste time in checking the status of the I/O device.

Which is not maskable interrupt?

In computing, a non-maskable interrupt (NMI) is a hardware interrupt that standard interrupt-masking techniques in the system cannot ignore. It typically occurs to signal attention for non-recoverable hardware errors. Some NMIs may be masked, but only by using proprietary methods specific to the particular NMI.

What is masking and why it is needed in microprocessor?

It is used to isolate specific bits within some multi-bit word, like a byte. If you want to read some specific bits within a word, you apply a mask, by performing a boolean ‘AND’ operation. The operands in the boolean operation are the word of interest, and the mask.

Which interrupt is non-maskable type?

Common examples of non-maskable interrupt include types of internal system chipset errors, memory corruption problems, parity errors and high-level errors needing immediate attention.

What is the difference between a maskable and non-maskable interrupt?

When maskable interrupt occur, it can be handled after executing the current instruction. When non-maskable interrupts occur, the current instructions and status are stored in stack for the CPU to handle the interrupt. Maskable interrupts help to handle lower priority tasks.

What are the advantages of interrupt in CPU?

It increases the efficiency of CPU. It decreases the waiting time of CPU. Stops the wastage of instruction cycle. CPU has to do a lot of work to handle interrupts, resume its previous execution of programs (in short, overhead required to handle the interrupt request.).

What are the different types of interrupt?

1. Maskable Interrupt : An Interrupt that can be disabled or ignored by the instructions of CPU are called as Maskable Interrupt.The interrupts are either edge-triggered or level-triggered or level-triggered. 2. Non-Maskable Interrupt :

What is the difference between an exception and an interrupt?

An exception is an unexpected event from within the processor. Interrupt is an unexpected event from outside the process. Whenever an exception or interrupt occurs, the hardware starts executing the code that performs an action in response to the exception.

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