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MC9S12XS256 Datasheet, PDF (136/736 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers
Memory Mapping Control (S12XMMCV4)
The two fixed 4KB pages (0xFE, 0xFF) contain unimplemented area in the
range not occupied by RAM if RAMSIZE is less than 8KB (Refer to
Section 3.4.2.3, “Implemented Memory Map).
S12XS Family Reference Manual, Rev. 1.09
136
Freescale Semiconductor