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Reading data from par0

I want to read data(d0-d7,input/output) from the parallel port 
par0.Normally,when I want to read data from an input/output port I need 
high impedance at the entrance. Is it enough If I read the register 
R_PAR0_STATUS_DATA(0-7) to get this high impedance and apply an 
input?When can I apply an input, and when can I read it, in what moment?

Ion Cadierno Gomez
Mondragon Unibertsitatea(Arrasate)
Basque Country