S912XEP100J5MAG Datasheet, PDF (196/1324 Pages) Freescale Semiconductor, Inc – Features of the MC9S12XE-Family are listed here. Please see Table D-2.for memory options and Table D-2. for the peripheral features that are available on the different family members.

Chapter 3 Memory Mapping Control (S12XMMCV4)
RESET
010
Special
Test
(ST)
010
100
101
Normal
100
RESET
Single-Chip
101
110
(NS)
111
100
Normal
Expanded
(NX)
101
101
RESET
001
RESET
Emulation
Single-Chip
(ES)
001
101
001
011
Special
Single-Chip
(SS)
000
000
RESET
Emulation
Expanded
(EX)
011
011
RESET
Transition done by external pins (MODC, MODB, MODA)
RESET
Transition done by write access to the MODE register
110
Illegal (MODC, MODB, MODA) pin values.
111
Do not use. (Reserved for future use).
Figure 3-5. Mode Transition Diagram when MCU is Unsecured
MC9S12XE-Family Reference Manual Rev. 1.25
196
Freescale Semiconductor