> I wrote a program that sends a number (multiple digits) to the
> serial port

Of a PC ?

> I am attempting to use the PIC 16F84 to retrieve this number
> from the serial port

Attempt to use the 16F628 (or anything more modern than the
F84) if you can. It has a built-in serial port and would make your
job easier (but there are serial routines for the F84 on the web).
You'll need to be using a UART interface like the MAX232 to
match the PIC to the PC (?)

> display it on 22 LSD digits

Like a 16x2 LCD display ?

It's a fairly simple task and not much hardware is involved. Some more
details would be helpful. For example, the digits will be available at the
serial port one at a time. So the PC (?) waits while the PIC gets them -
meaning a little handshaking is needed. Not very important, but are
these ASCII characters, hex, other ? Is pick-up time important ? This
could affect the speed you choose for the PIC. And so on.........

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