I have a Pic18F47J53. It has a pin called VDDCORE The PIC18F47J53 family of devices provides an on-chip voltage regulator to supply the correct voltage levels to the core. Parts designated with an F part number (such as PIC18F47J53) have the voltage regulator enabled. These parts can run from 2.15V-3.6V on VDD, but should have the VDDCORE pin connected to VSS through alow-ESR capacitor. It looks like this is a regulator output. Why would I need that? Shouldn't I be supplying a regulated voltage already? Or do I misunderstand. What is "the core". It calls for a cap on that pin. Do I need it if I am not using that ourput?