Chapter 3 Memory Mapping Control (S12XMMCV4)
MC9S12XE-Family Reference Manual , Rev. 1.19
224
Freescale Semiconductor
3.5.3.4
ROM Control in Emulation Expanded Mode
In emulation expanded mode the external bus will be connected to the emulator and to the application. If
the ROMON bit is set, the internal FLASH provides the data. If the EROMON bit is set as well the
emulator observes all CPU internal actions, otherwise the emulator provides the data and traces all CPU
actions (see
). When the ROMON bit is cleared, the application memory provides the data and
the emulator will observe the CPU internal actions (see
).
Figure 3-27. ROMON = 1 in Emulation Expanded Mode
EROMON = 1
Application
MCU
Flash
Memory
Emulator
EROMON = 0
Application
MCU
Memory
Emulator
Flash
Generator
Observer
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