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Doubt using 82C55

  1. Apr 14, 2009 #1
    I have a basic doubt about the usage pf 82C55.

    Wanted to know when exactly it is used. Eg: For a keyboard you have to use a 82C55 but for a LCD it is not necessary. So when exactly do we use it??
     
  2. jcsd
  3. Apr 14, 2009 #2

    berkeman

    User Avatar

    Staff: Mentor

    Can you give us some links to application notes for that PPI part? What are your thoughts on when and why it is used?
     
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