interrupt request การใช้

• Typical video display circuits generate interrupt request for the computer's microprocessor.
• This event is called trigger and causes an interrupt request.
• Interrupt ReQuest * what * is not less than or equal to * what *?
• First, let's learn a little about this thing called IRQ, an abbreviation of Interrupt Request.
• One unassigned line of the S-100 bus then was reassigned to support the non-maskable interrupt request.
• The act of initiating a hardware interrupt is referred to as an interrupt request ( IRQ ).
• Also, interrupt requests will have been disabled by executing or, requiring that the operating system re-enable them.
• The problem involves something the Interrupt Request ( IRQ ) lines, represented as a number from 0 to 15.
• When the computer is first turned on, compatible devices are identified and assigned non-conflicting addresses and interrupt request numbers.
• It could be that CD-ROMs produce excessive interrupt requests, in which case they hog your CPU with IRQs asking for attention.
• To look for an IRQ conflict ( IRQ means interrupt request channel, click on the Start button and open the control panel.
• Despite interrupt requests ( IRQ ) having been disabled prior to the instruction, the MPU will respond to any hardware interrupt while waiting.
• The mappings in this table are called Interrupt Request Levels, or IRQLs, and a separate IRQL is kept for each processor in a multiprocessor system.
• There are three registers, an Interrupt Mask Register ( IMR ), an Interrupt Request Register ( IRR ), and an In-Service Register ( ISR ).
• Upon detecting assertion of the interrupt line, the CPU must search through the devices sharing the interrupt request line until one who triggered the interrupt is detected.
• The number of hardware interrupts is limited by the number of interrupt request ( IRQ ) lines to the processor, but there may be hundreds of different software interrupts.
• :External interrupts are triggered by falling / rising edges or high / low potential at the interrupt port, leading to an interrupt request ( IRQ ) in the controller.
• Level-triggered interrupt is favored by some because it is easy to share the interrupt request line without losing the interrupts, when multiple shared devices interrupt at the same time.
• In addition to its timekeeping features, the TOD can be configured to act as an alarm clock, by arranging for it to generate an interrupt request at any desired time.
• More modern hardware often has one or more interrupt status registers that latch the interrupt requests; well written edge-driven interrupt software often checks such registers to ensure events are not missed.