In Full Chip Simulation (FCS) mode, this module lets you simulate all the functionality of the Voltage Reference (VREF) module. The module is a bandgap buffer system intended to supply an accurate voltage output that is trimmable by an 8-bit register in 0.5 mV steps. It can be used internally for the analog peripherals of an ADC channel or for an ACMP input. VREF has three operating modes that provide different levels of load regulation and power consumption.