In ADC simulation, what matters should be paid attention to on the aspects of the simulator?
As the analog signals are vulnerable be effected of external circuit, so in hardware
design, user should ensure the stability of analog signals and also make the analog
signal line input to A/D port as short as possible. On the aspect of simulator, it
has made special treatment on reference voltage source (to ensure its stability),
so in emulation, user should short AVRFEH and AVREFL jumper needle.