Chapter 3 Memory Mapping Control (S12XMMCV4)
MC9S12XE-Family Reference Manual Rev. 1.19
Freescale Semiconductor
199
;many cases assemblers are “direct page aware” and can
;automatically select direct mode.
3.3.2.5
MMC Control Register (MMCCTL1)
Read: Anytime. In emulation modes read operations will return the data from the external bus. In all other
modes the data are read from this register.
Write: Refer to each bit description. In emulation modes write operations will also be directed to the
external bus.
CAUTION
XGATE write access to this register during an CPU access which makes use
of this register could lead to unexpected results.
Address: 0x0013 PRR
7
6
5
4
3
2
1
0
R
TGMRAMON
0
EEEIFRON
PGMIFRON
RAMHM
EROMON
ROMHM
ROMON
W
Reset
0
0
0
0
0
EROMCTL
0
ROMCTL
= Unimplemented or Reserved
Figure 3-10. MMC Control Register (MMCCTL1)
Table 3-11. MMCCTL1 Field Descriptions
Field
Description
7
TGMRAMON
EEE Tag RAM and FTM SCRATCH RAM visible in the memory map
Write: Anytime
This bit is used to made the EEE Tag RAM nd FTM SCRATCH RAM visible in the global memory map.
0 Not visible in the memory map.
1 Visible in the memory map.
5
EEEIFRON
EEE IFR visible in the memory map
Write: Anytime
This bit is used to made the IFR sector of EEE DATA FLASH visible in the global memory map.
0 Not visible in the memory map.
1 Visible in the memory map.
4
PGMIFRON
Program IFR visible in the memory map
Write: Anytime
This bit is used to made the IFR sector of the Program Flash visible in the global memory map.
0 Not visible in the memory map.
1 Visible in the memory map.
3
RAMHM
RAM only in higher Half of the memory map
Write: Once in normal and emulation modes and anytime in special modes
0 Accesses to $4000–$7FFF will be mapped to $14_4000-$14_7FFF in the global memory space (external
access).
1 Accesses to $4000–$7FFF will be mapped to $0F_C000-$0F_FFFF in the global memory space (RAM area).
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