Pin floating

[Einly]

Dear all,

I am using PIC16f876, Pin B1 to sense input signal. When I let Pin B1 to be floating, I sense either 0 or 1 (both). Why?
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This message was ported from CCS's old forum
Original Post ID: 144516513

[Douglas Kennedy]

:=Dear all,
:=
:=I am using PIC16f876, Pin B1 to sense input signal. When I let Pin B1 to be floating, I sense either 0 or 1 (both). Why?
Float is just a form of input so if there is no external signal pulling the pin either high or low the pin's state is indeterminate. Now if you latch the value through by reading the port a snapshot of the pin state is made and depending on the environment at that specific moment it will be seen as a 1 or a 0. Think of float as meaning unloaded or no output load.
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This message was ported from CCS's old forum
Original Post ID: 144516514