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I'm trying to use ADC module in PIC18f46k80 and I want to connect VREF- to AVSS. But the problem is that I can't find AVSS pin in this microcontroller: enter image description here Is AVSS the same as VSS here? meaning I simply have to connect VSS to gnd?

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That is correct. On the package types which does not have the AVSS and AVDD pins, they are internally connected to VSS/VDD.

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