Table of Contents
- 1 Which register is used for interrupt handling?
- 2 What are 3 types of registers in CPU?
- 3 Which register does contain the control bits for interrupt sense control?
- 4 Which CPU operating mode allows a process to execute restricted CPU instructions and access all memory locations?
- 5 What is a hardware interrupt?
- 6 What is ISR (Interrupt handler)?
Which register is used for interrupt handling?
An interrupt control register, or ICR, is a hardware register in a computer chip used to configure the chip to generate interrupts—to raise a signal on an interrupt line—in response to some event occurring within the chip or a circuit connected to the chip.
What are 3 types of registers in CPU?
Different Classes of CPU Registers
- Accumulator: This is the most frequently used register used to store data taken from memory.
- Memory Address Registers (MAR):
- Memory Data Registers (MDR):
- General Purpose Registers:
- Program Counter (PC):
- Instruction Register (IR):
- Condition code register ( CCR ) :
How many registers are used to control interrupt operation?
REGISTER CONFIGURATION for external interrupt These are the registers for interrupt operation and minimum 1 register can be used to control the interrupt operation in PIC18F452 which are: RCON (Reset Control Register)
Which register keeps track of interrupt priority in 8051?
8051 has two levels of interrupt priorities: high or low. By assigning priorities, we can control the order in which multiple interrupts will be serviced. Priorities are set by bits in a special function register called IP, which is at the byte address B8H. This register is also bit addressable.
Which register does contain the control bits for interrupt sense control?
External Interrupt Control Register
The External Interrupt Control Register A contains control bits for interrupt sense control.
Which CPU operating mode allows a process to execute restricted CPU instructions and access all memory locations?
Supervisor mode is “an execution mode on some processors which enables execution of all instructions, including privileged instructions. It may also give access to a different address space, to memory management hardware and to other peripherals. This is the mode in which the operating system usually runs.”
How to identify the interrupting device?
The Points to be noted in identifying the interrupting device are: The CPU services all the interrupts one by one as it finds the chance to service the interrupt. Amongst the I/O controllers, Interrupt priority is assigned in the hardware. So the highest priority one gets serviced first and cleared of pending interrupt.
How does the CPU service all the interrupts?
The CPU services all the interrupts one by one as it finds the chance to service the interrupt. Amongst the I/O controllers, Interrupt priority is assigned in the hardware. So the highest priority one gets serviced first and cleared of pending interrupt. This method is called Daisy Chaining.
What is a hardware interrupt?
In a hardware interrupt, all the devices are connected to the Interrupt Request Line. A single request line is used for all the n devices. To request an interrupt, a device closes its associated switch. When a device requests an interrupt, the value of INTR is the logical OR of the requests from individual devices.
What is ISR (Interrupt handler)?
ISR is also called Interrupt Handler. Interrupts are recognized and serviced by CPU at the end of the current instruction execution. Context switching of the Processor happens while breaking for ISR. This part is common to all kinds of interrupts.