Look at the 16C73 or 16C74. They should do what you want. It has a built in
UART and the A/D channels. I have driven multiplexed displays with it too.
The problem will be how big the array is you want to feed and how you are
driving it.


At 04:35 PM 11/14/97 GMT, you wrote:
>For my final year degree project I am going to
>build an LED display matrix,capable of displaying
>moving messages. Some sort of Microprocessor
>system is needed to control the display matrix.
>Because of the multiplexing method that is going
>to be used to control the display,a fast PIC with
>the following facilities is required :-
>
>- plenty of I/O lines.
>
>- an A/D converter (as it's also going to be
>  connected to a temperature sensor).
>
>- Serial comms facilities to allow connection to
>  a PC via RS 232 serial port.
>
>- It must be capable of accessing external RAM as
>  this is where the binary patterns representing
>  the message will be stored.
>
>I would appreciate any recommendations on what
>type of PIC would be most suitable for this
>application.
>
>
Larry G. Nelson Sr.
mailto:L.Nelson@ieee.org
http://www.ultranet.com/~nr