MC9S12HY64 Datasheet, PDF (157/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Interrupt Module (S12SINTV1)
WAI or STOP instruction. This features works the same rules like any interrupt request, i.e. care must be
taken that the X interrupt request used for wake-up remains active at least until the system begins execution
of the instruction following the WAI or STOP instruction; otherwise, wake-up may not occur.
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
Freescale Semiconductor
157