I/O Port simulation

I monitering my I/O port from Peripherials -> I/O-ports -> Port 0

But the value of P0 and Pins are always diferrent
That is very strange..

I use P0 as an LCD data bus.
I set the value of P0, When I want to display a character on LCD.

but Pins bits can't reflect the value of P0

So my LCD display can't work normally.

Does any one known what happens?

thank you..

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