Table of Contents
- 1 What are the sequence of operation takes place when an interrupt signal is recognized in 8085 microprocessor?
- 2 What are the sequence of events that occur when intr is recognized by the processor?
- 3 What is an interrupt in processor?
- 4 What happens when HLT instruction is executed in processor?
- 5 Which is the first machine cycle of an instruction?
What are the sequence of operation takes place when an interrupt signal is recognized in 8085 microprocessor?
8085 instruction set includes eight software interrupt instructions called Restart (RST) instructions. These are one byte instructions that make the processor execute a subroutine at predefined locations. 8085 have five hardware interrupts – INTR, RST 5.5, RST 6.5, RST 7.5 and TRAP.
What are the sequence of events that occur when intr is recognized by the processor?
The sequence of events involved in handling an IRQ: The processor interrupts the program currently being executed. The device is informed that its request has been recognized and the device deactivates the request signal. The requested action is performed. An interrupt is enabled and the interrupted program is resumed.
Which of the following operation is performed when an interrupt occurs?
Discussion Forum
| Que. | Which operation is performed by an interrupt handler? |
|---|---|
| b. | Loading the interrupt handling code and executing it |
| c. | Once done handling, bringing back the system to the original state it was before the interrupt occurred |
| d. | All of these |
| Answer:All of these |
What is an interrupt in processor?
An interrupt is an event that alters the sequence in which the processor executes instructions. An interrupt might be planned (specifically requested by the currently running program) or unplanned (caused by an event that might or might not be related to the currently running program).
What happens when HLT instruction is executed in processor?
In the x86 computer architecture, HLT (halt) is an assembly language instruction which halts the central processing unit (CPU) until the next external interrupt is fired. Interrupts are signals sent by hardware devices to the CPU alerting it that an event occurred to which it should react.
How are interrupts processed?
An interrupt is an event that alters the sequence in which the processor executes instructions. These interrupts occur when the program issues an SVC to request a particular system service. An SVC interrupts the program being executed and passes control to the supervisor so that it can perform the service.
Which is the first machine cycle of an instruction?
fetch cycle
The first machine cycle of an instruction is always fetch cycle. Using tristate buffer, more than one device can transmit information over the data bus by enabling only one device at a time. Fetch, Execute, Decode and Read effective address.