DSPIC33EV256GM104 ADC reference monitoring
I'm looking for a way to monitor the reference voltage of the ADC. This means I also want to recognize shifts on the ground line.
For the PIC16 this is easy with the FVR, but the DSPIC33 seems to have nothing similiar.
I had the idea to measure AVDD and AVSS, but as I can see, I have to spent two ADC channels for doing that (and I'm actually not sure whether this makes sense). Is there any way to measure the AVDD and AVSS voltage internally or getting a information about the ADC reference voltage?