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  2. Interrupts in 65xx processors - Wikipedia

    en.wikipedia.org/wiki/Interrupts_in_65xx_processors

    The detection of a RESET signal causes the processor to enter a system initialization period of six clock cycles, after which it sets the interrupt request disable flag in the status register and loads the program counter with the values stored at the processor initialization vector ($00FFFC – $00FFFD) before commencing execution. [1]

  3. Interrupt flag - Wikipedia

    en.wikipedia.org/wiki/Interrupt_flag

    The Interrupt flag (IF) is a flag bit in the CPU's FLAGS register, which determines whether or not the (CPU) will respond immediately to maskable hardware interrupts. [1] If the flag is set to 1 maskable interrupts are enabled. If reset (set to 0) such interrupts will be disabled until

  4. FLAGS register - Wikipedia

    en.wikipedia.org/wiki/FLAGS_register

    The FLAGS register is the status register that contains the current state of an x86 CPU.The size and meanings of the flag bits are architecture dependent. It usually reflects the result of arithmetic operations as well as information about restrictions placed on the CPU operation at the current time.

  5. Control register - Wikipedia

    en.wikipedia.org/wiki/Control_register

    Clock-comparator subclass mask 0 21 CPU-timer subclass mask 0 22 Service-signal subclass mask 0 24 Set to 1 0 25 Interrupt-key subclass mask 0 26 Set to 1 0 27 ETR subclass mask 0 28 Program-call-fast 0 29 Crypto control 1 0 Primary space-switch-event control 1 1-19 Primary segment-table origin 1 22 Primary subspace-group control 1 23

  6. Interrupt handler - Wikipedia

    en.wikipedia.org/wiki/Interrupt_handler

    In computer systems programming, an interrupt handler, also known as an interrupt service routine or ISR, is a special block of code associated with a specific interrupt condition. Interrupt handlers are initiated by hardware interrupts, software interrupt instructions, or software exceptions , and are used for implementing device drivers or ...

  7. Interrupt priority level - Wikipedia

    en.wikipedia.org/wiki/Interrupt_priority_level

    The interrupt priority level (IPL) is a part of the current system interrupt state, which indicates the interrupt requests that will currently be accepted. The IPL may be indicated in hardware by the registers in a programmable interrupt controller, or in software by a bitmask or integer value and source code of threads. [1]

  8. Programmable interrupt controller - Wikipedia

    en.wikipedia.org/wiki/Programmable_interrupt...

    In computing, a programmable interrupt controller (PIC) is an integrated circuit that helps a microprocessor (or CPU) handle interrupt requests (IRQs) coming from multiple different sources (like external I/O devices) which may occur simultaneously. [1]

  9. Interrupt control register - Wikipedia

    en.wikipedia.org/wiki/Interrupt_control_register

    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. [1] [2]