Datasheet

Memory Mapping Control (S12XMMCV4)
S12XS Family Reference Manual, Rev. 1.13
138 Freescale Semiconductor
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).