i've read the 8051 by m mazizdi. in the pins on the pins he says to configure any port as a input port we should write 1's to all its pins. but i have a device mitel's 88435 connected to it. won't it have any efect on it's(88435's) operation? also is the confiuration done once and for all or is it done before interfacing?
please do help me out 'cuz my prject has been stalled.