1.

Can Port 0 Be Used As Input Output Port?

Answer»

Yes, port 0 can be USED as input output port. Port 0 is an open drain unlike ports 2, 3, 4. To USE it as input or output the 10K OHM pull-up resisters are connected to it externally. To make port 0 as input port it must be programmed by writing 1 to all bits.

Example:

  1. MOV A,#0FFH
  2. MOV P0,A

Yes, port 0 can be used as input output port. Port 0 is an open drain unlike ports 2, 3, 4. To use it as input or output the 10k ohm pull-up resisters are connected to it externally. To make port 0 as input port it must be programmed by writing 1 to all bits.

Example:


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