5.1.8 AV_CC

AV_CC is the supply voltage pin for the A/D Converter, Port C (3:0), and ADC (7:6). It should be externally connected to V_CC, even if the ADC is not used. If the ADC is used, it should be connected to V_CC through a low-pass filter. Note that Port C (5:4) use digital supply voltage, V_CC.