I recently came across this circuit in which the oscillator capacitors are connected to VCC and not to GND. Researching I've read many comments stating that VCC and GND are at the same AC potential.
- What does that mean?
- Why are the capacitors connected to VCC and not GND even though the datasheet of the microcontroller states it?
- What is that diode for?, never seen one before in that configuration.
- Where can I find more information about these topics?
I also read about VCC being noisier than GND due to the line impedance.
This schematic is part of a DMP expansion card model 712-8. Values are not real, just placed components there for representation. Microcontroller is a Zilog z86e0812.
**missed a 100nanoFarad cap from VCC to GND near the diode.