Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Time
TIM_TIME
Parameter: Extend
TIM_EXTEND
Parameter: Single
TIM_SINGLE
Parameter: Animation Time
IN_TIM_ATIME
Parameter: Start
IN_TIM_START
Parameter: On
OUT_TIM_ON
Parameter: Time
OUT_TIM_TIME
Parameter: Time In Percent
OUT_TIM_PERCENT