I have a 12F683 with an analog input device on GP0. No problem with that.
I want to piggy back an lcd on the same pin and drive it between adc aquisition.

So in escence during runtime i want to swap the pin back and forth between an adc input and a serial output.

My analog device is quite high impedance so the high low pic output will not affect it. Also the lcd input is high impedance and should not affect the voltage data, and should ignore is as invalid serial data.

I want to

1) initialise pin as analog input and take a reading
2) initialise pin as serial output and send data to lcd
3) Repeat

Any issues? I'm only taking adc readings 5 times a second or so. Rest of the time pin can be sending serial data to lcd.