What are the steps taken by 8086 when interrupt comes?

Posted By on November 23, 2014


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The following steps occur when an interrupt occurs ( both for hardware and software )

– First thing the contents of the flag register the CS and IP are pushed into the stack.

– To disable the single steps and INTR interrupts the TF and IF are cleared.

– The program then jumps to the beginning or starting address of the ISS.

– When the IRET gets executed in the last line ( this occurs at the end of the ISS) the CS and IP flag contents are popped from the stack and placed in the appropriate registers.

– Once all the flags are restored to their original condition the IF and TF are also restored to their previous values

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Posted by Akash Kurup

Founder and C.E.O, World4Engineers Educationist and Entrepreneur by passion. Orator and blogger by hobby

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