Control word format of 8255 for i o-mode
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There are two basic operational modes of 8255:
Bit Set/Reset mode (BSR mode).
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.
Bit Set/Reset mode (BSR mode).
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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