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Asked: 2022-03-31T11:04:44+05:30 In:

The 8255 operates in 2 modes,Answer the following wrt 8255 modes Which bit of control word register is responsible for …

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The 8255 operates in 2 modes,Answer the following wrt 8255 modes

  1. Which bit of control word register is responsible for mode selection
  2. Role of D5 and D6 of CWR
  3. Value of CWR for setting PC3
  4. Value o fD3,D2,D1 to select PC4
  5. Value o fD3,D2,D1 to select PC2
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    1 Answer

    2. Saurav kumar
      This answer was edited.

      1.D7 bit of control word register is responsible for mode selection.

      2.D5, D6 are used for mode selection for group A .The format is as follow:

      D6 D5 Mode
      0 0 0
      0 1 1
      1 x 2

      3.Value of CWR for setting PC3 is 07H.

      4. D3=1,D2=0,D1=0 to select PC4.

      5 . D3=0,D2=1,D1=0 to select PC2.

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