27.1.1 Port Configuration
The ADC will convert the voltage on a pin whether or not the ANSEL bit is set. When converting analog signals, the I/O pin may be configured for analog by setting the associated TRIS and ANSEL bits. Refer to the “I/O Ports” section for more information.
Important: Analog voltages on any
pin that is defined as a digital input may cause the input buffer to conduct excess
current.