Up to eight analog input channels, CH[n](n=0..7), can be configured.
See Shared resources for shared input with comparators.
For the SAADC peripheral to operate in one-shot mode, any available channel can be enabled. If more than one CH[n] is configured, SAADC enters scan mode.
An analog input is selected as a positive converter input and enabled by setting register CH[n].PSELP.
An analog input is selected as a negative converter input if register CH[n].PSELN is set. The register CH[n].PSELN will have no effect unless differential mode is enabled and CH[n].PSELP is set, see MODE field in register CH[n].CONFIG.
Note: It is not recommended to use the same analog input pin for multiple analog peripheral
functions. See Shared resources.