Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Mode
GV_MONOFLOP_MODEParameter: Trigger
GV_MONOFLOP_TRIGGERParameter: Time
GV_MONOFLOP_TIMEParameter: Duration
GV_MONOFLOP_DURATIONParameter: Reset
GV_MONOFLOP_RESETParameter: Out
GV_MONOFLOP_OUTParameter: Count
GV_MONOFLOP_COUNTParameter: State
GV_MONOFLOP_STATE