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Operating Modes

There are three basic modes of operation of 8255 as follows:

  • Mode 0 Basic Input/Output
  • Mode 1 Strobed Input/Output
  • Mode 2 Bi-directional Bus

Mode 1—Strobed Input/Output

Timing diagram of Mode 1

 

Input mode of ports A and B in Mode 1
 

 

Output of ports A and B in Mode 1

 

Timing diagram of Mode 1 with Port A and Port B as output port

 

Bit Set/Reset Mode

 

Bit set/reset format

 





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