PIC18 Serial Communications

Greetings,

I have a PIC18F67K90 chip that I am trying to configure for serial communication with a computer.
For this particular chip, pins (TX/RX) 4/5 and 31/32 are dedicated to serial communication. (USART)
These pins are already used for other things.

I was wondering if I could configure an unused TTL/Digital I/O pin to read in serial data to the USART or do I have to use the dedicated pins?

Any insight is appreciated.
Thanks in advance!