{"id":1401,"date":"2020-03-03T08:22:56","date_gmt":"2020-03-03T08:22:56","guid":{"rendered":"https:\/\/bcisnotes.com\/thirdsemester\/?p=1401"},"modified":"2021-06-17T11:44:59","modified_gmt":"2021-06-17T11:44:59","slug":"interrupt-processing-sequence-interrupt-handling-bcis-notes","status":"publish","type":"post","link":"https:\/\/bcisnotes.com\/thirdsemester\/computer-architecture-and-microprocessor\/interrupt-processing-sequence-interrupt-handling-bcis-notes\/","title":{"rendered":"Interrupt Processing Sequence || Interrupt Handling || Bcis Notes"},"content":{"rendered":"

Interrupt Processing Sequence<\/h2>\n

The occurrence of an interrupt fires a number of events both in processor hardware and software. The figure below displays a sequence.<\/p>\n

\"Interrupt<\/p>\n

The occurrence of interrupt triggers a number of events, both in processor hardware and in
\nsoftware. The interrupt-driven I\/O operation takes the following steps.<\/p>\n

    \n
  1. The I\/O unit issues an interrupt signal to the processor for the exchange of data between
    \nthem.<\/li>\n
  2. \u00a0The processor finishes the execution of the current instruction before responding to the
    \ninterrupt.<\/li>\n
  3. \u00a0The processor sends an acknowledgment signal to the device that it issued the interrupt.<\/li>\n
  4. \u00a0The processor transfers its control to the requested routine called \u201cInterrupt Service
    \nRoutine (ISR)\u201d by saving the contents of program status word (PSW) and the program
    \ncounter (PC).<\/li>\n
  5. \u00a0The processor now loads the PC with the location of interrupt service routine and the
    \nfetches the instructions. The result is transferred to the interrupt handler program.<\/li>\n
  6. \u00a0When interrupt processing is completed, the saved register\u2019s value is retrieved from the
    \nstack and restored to the register.<\/li>\n
  7. \u00a0Finally, it restores the PSW and PC values from the stack.<\/li>\n<\/ol>\n

    Interrupt priority:<\/strong>
    \nMicrocomputers can transfer data to or from an external device using interrupt through INTR pin. When a device wants to communicate with the microcomputer, it connects to the INTR pin and makes it high or low depending on a microcomputer. The microcomputer responds by sending a signal via its pin called interrupt acknowledgment INTA.<\/p>\n

    You may also like I\/O Address Decoding<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Interrupt Processing Sequence The occurrence of an interrupt fires a number of events both in processor hardware and software. The figure below displays a sequence. […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":1404,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"yoast_head":"\nInterrupt Processing Sequence || Interrupt Handling || Bcis Notes<\/title>\n<meta name=\"description\" content=\"The occurrence of an interrupt fires a number of events both in processor hardware and software. 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