S912XHZ512F1VAG Datasheet, PDF (375/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256

8.4.3 Wait Mode Operation
During wait mode, XOSC is not impacted.
Chapter 8 Pierce Oscillator (S12XOSCLCPV1)
8.4.4 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.
MC9S12XHZ512 Data Sheet, Rev. 1.06
Freescale Semiconductor
375