MICROPROCESSOR 8255
ARCHITECTURE OF 8085
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Port A
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Port B
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Port C
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All of the above
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Detailed explanation-1: -Port C is used for generating handshake signals.
Detailed explanation-2: -Port C can function independently either as input or as output ports.
Detailed explanation-3: -They are input pins if Port C upper is programmed for input operation. These four pins are used by the 8255 for communicating with an I/O device. These pins are output pins if Port C lower is programmed as an output port. They are input pins if Port C lower is programmed for input operation.
Detailed explanation-4: -For 8255-based devices, the ports in the task affect which handshaking lines are used. Always use the handshaking lines associated with the highest order port in the task. For instance, if you want to group ports 1 and 2 into a single task, use the handshaking lines associated with port 2.