MICROPROCESSOR 8255
ARCHITECTURE OF 8085
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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either 4 bit input or output ports
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either 8 bit input or output ports
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Bi-directional port
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None of the above
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Detailed explanation-1: -Explanation: The parallel input-output port chip 8255 is also known as programmable peripheral input-output port. Explanation: Port C can function independently either as input or as output ports. Explanation: By programming the bits of control word register, the operations of the ports are specified.
Detailed explanation-2: -The port C upper and port C lower can be used in combination as an 8-bit port C. Both the port C are assigned the same address. Thus one may have either three 8-bit I/O ports or two 8-bit and two 4-bit ports from 8255. All of these ports can function independently either as input or as output ports.
Detailed explanation-3: -Features of 8255A It consists of 3 8-bit IO ports i.e. PA, PB, and PC. Address/data bus must be externally demux’d. It is TTL compatible.