Intel 8255 - Operational Modes of 8255

Operational Modes of 8255

There are two basic operational modes of 8255:

  1. Bit set/reset Mode (BSR Mode).
  2. Input/Output Mode (I/O Mode).

The two modes are selected on the basis of the value present at the D7 bit of the Control Word Register. When D7 = 1, 8255 operates in I/O mode and when D7 = 0, it operates in the BSR mode.

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