I want to simulate performance of a code uses ADC module in MKL25Z board using Keil uVision5 simulator , this requires supplying virtual signal to one of its ADC channels , i tried adding variables to logic analyzer ( AD0 , AD00 ) but it gave me "Unknown signal error , so i typed " DIR VTREG " in command window and non of the signals was related to A/D module ( this explains the error ) , so i want to know how to enter a signal with certain value and link this signal to a particular ADC pin in my board .