PXS20RM Datasheet, PDF (1365/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Wakeup Unit (WKPU)
NOTE
The overrun flag is cleared by writing a ‘1’ to the appropriate overrun bit in
the NSR register. If the status bit is cleared and the overrun bit is still set, the
pending interrupt will not be cleared.
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
51-7