33.1.2 Port Configuration
The ADC will convert the voltage level 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” chapter for more information.
Important: Analog voltages on any
pin defined as a digital input may cause the input buffer to conduct excess
current.