HELP EXAM If the value A4H is written to the control register of an 8255, what is the mode and I/O configuration of port A and port B ?
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Mode 1 – Handshake or Strobed I/O
In this mode the Port A and Port B can be used as input or output ports, the port C are used for handshaking. In this mode the inputs and outputs are latched. This mode also has the interrupt handling capability, and signal control to match the speed of CPU and IO devices.
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