8051 MICROCONTROLLER
ARCHITECTURE OF 8085
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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PORT 0
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PORT 1
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PORT 2
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PORT 3
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Detailed explanation-1: -Port 1. P1 is a true I/O port as it doesn’t have any alternative functions as in P0, but this port can be configured as general I/O only.
Detailed explanation-2: -Port 1 (Pin 1 through 8) It is an 8-bit port (pin 1 through 8) and can be used either as input or output. It doesn’t require pull-up resistors because they are already connected internally. Upon reset, Port 1 is configured as an input port.
Detailed explanation-3: -Features of Port 1: Address is 90H. It has only one function – to act as an Input-Output port.
Detailed explanation-4: -Port 0 can be used as a normal bidirectional I/O port or it can be used for address/ data interfacing for accessing external memory when control ‘1’ the port is used for address/data interfacing, when the control is ‘0’ the port can be used as a bidirectional I/O port 0.