Hi!
20-Jul-98 13:38 Ricardo Ponte G wrote about "Any Ideas to add more Ports ????":

 >>         I'm working with the PIC16C715.  It has 13 I/O lines but I got to
 >> manipulate one LCD, read some extern values and control some devices.
 >>
 >>         I just want to be sure about the best way that I can add some I/O li
nes
 >> (Ports) with other devices like 82C55, because I'm not sure now if I'm
 >> going to need it.
 >>
 >>         What good device can I use with this PIC to add one or two Ports of
8
 >> lines ?.

    CD4094 was mentioned as a solution for output. It's
disadvantage is a relatively low output current.
    CD4014 and CD4021 can be used for input.


 >>         and with the LCD stuff:
 >>         What way is better: control it with 4 bit mode or 8 bit mode ?

    You are short in I/O pins. So 4-bit mode is the *best*. :)

--

                                    Vladimir M. Klochko
                            vmk@real.kiev.ua, Kiev, Ukraine.