摘录


Interrupts are signal that are sent across IRQ (Interrupt Request Line) by a hardware or software.

Interrupts allow devices like keyboard, serial cards and parallel ports to indicate that it needs CPU attention.

Once the CPU receives the Interrupt Request, CPU will temporarily stop execution of running program and invoke a special program called Interrupt Handler or ISR (Interrupt Service Routine).

The Interrupt Service or Interrupt Handler Routine can be found in Interrupt Vector table that is located at fixed address in the memory. After the interrupt is handled CPU resumes the interrupted program.

At boot time, system identifies all devices, and appropriate interrupt handlers are loaded into the interrupt table.

点评

NULL

原文

点击这里查看原文

其它

本帖内容由21QA云收藏工具自动生成,欢迎使用。

系统消息 若觉得内容不错,请点击左上角的"赞"图标,以优化网站的内容呈现。 另外,请及时验证注册邮箱,否则收不到21QA发出的红包。 官方Q群:250203055

asked 03 Apr '15, 22:00

%E8%B7%AF%E4%BA%BA%E7%94%B2's gravatar image

路人甲
131726860896

Be the first one to answer this question!
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link: [text](http://url.com/ "title")
  • image: ![alt](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:

×942
×325
×85
×1

question asked: 03 Apr '15, 22:00

question was seen: 800 times

last updated: 03 Apr '15, 22:00

powered by O*S*Q*A

粤ICP备14040061号-1