> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Nuno Pedrosa
> Sent: Thursday, May 13, 1999 7:44 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: Remote keypads - which PIC?
>
>
> Can a keypad share pins with the bus to an LCD?
>
> What about keypresses? How do you keep them from interfering
> with the LCD
> comms?

Be carefull !!!!!!!!!!!!! I have just designed at complete system with a
'84, 8x4 keyboard and a 80x2 display.
The display and keyboard share ports. Everything is okay except when i am
writeing to the display and two or more keys (from different rows) are
pressed at the same time. I do ofcause check if any key is pressed before i
write to the display. But this is a lag of design (my fault). So please
think again if it's worth it. They way i did was to share the 8
row-keyboard-pins with the 8-display-data-pins.

Regards
  Benjamin Petersen