MC9S12KG128 Datasheet, PDF (217/600 Pages) Freescale Semiconductor, Inc – Microcontrollers

6.4.3 Wait Mode Operation
During wait mode, XOSC is not impacted.
Chapter 6 Pierce Oscillator (S12OSCLCPV1)
6.4.4 Stop Mode Operation
XOSC is placed in a static state when the part is in stop mode except when pseudo-stop mode is enabled.
During pseudo-stop mode, XOSC is not impacted.
MC9S12KG128 Data Sheet, Rev. 1.15
Freescale Semiconductor
217