Write 8086 initialisation routine required to program 8255, Computer Engineering

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Write 8086 initialisation routine required to program 8255 for mode 1 with Port A and Port B as output Ports and Port C as an input port. Indicate all the relevant signals.

  • A, B can only change 1 byte at a time
  • C has individual bit set/reset capability
  • The Advantage is that non-dedicated circuit can change port configuration with software and no 'glue logic'.
  • Ports A, B, and C are used for I/O data.
  • Control register is programmed to select the operation mode of the three ports A, B, and C.
  • Mode0: simple I/O mode
  • Any of the ports A, B, CL and CU can be programmed as input or output.
  • No control of individual bits (all bits are out or all bits are in)

 


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