As shown in Figure 1, the inverting (-) input of an op amp is also connected to an analog multiplexer that allows one of a variety of input sources to be chosen. The selection is configured using the MUXNEG bit field of the Op Amp n Input Multiplexer (OPAMP.OPnINMUX) register. If the OPnINMUX register is changed while the OPn output is enabled, a glitch will occur on the output signal due to the opening and closing of analog switches, and some time will elapse before the output settles to the new value.