Chapter 3 Memory Mapping Control (S12XMMCV4)
MC9S12XE-Family Reference Manual , Rev. 1.19
222
Freescale Semiconductor
Figure 3-24. ROM in Single Chip Modes
3.5.3.2
ROM Control in Emulation Single-Chip Mode
In emulation single-chip mode the external bus is connected to the emulator. If the EROMON bit is set,
the internal FLASH provides the data and the emulator can observe all internal CPU actions on the external
bus. If the EROMON bit is cleared, the emulator provides the data (generator) and traces the all CPU
actions (see
Figure 3-25. ROM in Emulation Single-Chip Mode
3.5.3.3
ROM Control in Normal Expanded Mode
In normal expanded mode the external bus will be connected to the application. If the ROMON bit is set,
the internal FLASH provides the data. If the ROMON bit is cleared, the application memory provides the
data (see
MCU
Flash
No External Bus
EROMON = 1
Emulator
MCU
EROMON = 0
Emulator
Flash
MCU
Flash
Observer
Generator
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages