pic18f452 ttl level
Greetings,
First, what GPS are you using. Check the tx/rx signal level of that GPS Interface. If it is a GPS module, you dont need a MAX232. If it is a commercial GPS with a rs232 interface, you need convert that rs232 signals to ttl/cmos levels using a MAX232... so, check first your GPS interface features...
For example, im just starting with a Trimble Copernicus GPS Module, it dont need a level converter (max232), it interface to a PIC16F877A and works fine.
Best regards.......