PXD20RM Datasheet, PDF (847/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

After the interlock write, additional writes only affect the data to be programmed at the word location
determined by address bits [3:2]. Unwritten locations default to a data value of 0xffff_ffff. If multiple
writes are done to the same location the data for the last write is used in programming.
While DONE is low, EHV is high and PSUS is low the user may clear EHV, resulting in a program abort.
A program abort forces the module to step 8 of the program sequence. An aborted program results in PEG
being set low, indicating a failed operation. The data space being operated on before the abort contains
indeterminate data. The user may not abort a program sequence while in program suspend.
WARNING
Aborting a program operation leaves the FC addresses being programmed
in an indeterminate data state. This may be recovered by executing an erase
on the affected blocks.
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
21-35