
S1C8F360 TECHNICAL MANUAL
EPSON
11
3 CPU AND BUS CONFIGURATION
However, the area from 00F000H to 00FFFFH is
assigned to internal memory and cannot be
used to access an external device.
CPU operation in this mode is equivalent to the
S1C88 core CPU Model3 minimum mode. The
area within physical space 000000H to 1FFFFFH
in the MPU mode or physical space 080000H to
27FFFFH + internal memory in the MCU mode
is effective as a target for accessing.
Furthermore, since program memory expansion
is limited to less than 64K bytes configured with
the common area (000000H to 007FFFH) and
one optional bank area (internal PROM + 32K in
the MCU mode), this mode is suitable for small-
to mid-scale program memory and large-scale
data memory systems.
_____
The address range of chip enable (CE) signals in
this mode is fixed at 512K bytes.
27FFFFH
:
080000H
07FFFFH
010000H
00FFFFH
000000H
See Figure 3.2.1 for the internal memory
- MPU mode -
External
memory area
Internal memory
External
memory area
1FFFFFH
- MCU mode -
External
memory area
Internal memory
Unused area
Fig. 3.5.2.3 Memory map for the expanded
512K minimum mode
s Expanded 512K maximum mode
The expanded 512K maximum mode setting
applies when the S1C8F360 is used with over
64K bytes and less than 512K bytes
× 4 of
external expanded memory. This mode is
usable regardless of the MCU/MPU mode
setting.
Because internal PROM is being used in the
MCU mode, external memory in this model can
be assigned to the area from 080000H to
27FFFFH.
Since the internal PROM area is released in the
MPU mode, external memory in this model can
be assigned to the area from 000000H to
1FFFFFH.
The area from 00F000H to 00FFFFH is assigned
to internal memory and cannot be used to
access an external device.
CPU operation in this mode is equivalent to the
S1C88 core CPU Model 3 maximum mode, the
area within physical space 000000H to 1FFFFFH
in the MPU mode or physical space 080000H to
27FFFFH + internal memory in the MCU mode
is effective as a target for accessing. In the above
mentioned physical space, since program
memory and data memory can be secured with
an optional (maximum 512K bytes
× 4 program
+ data) size, this mode is suitable for systems
with large-scale program and data capacity.
_____
The address range of chip enable (CE) signals in
this mode is fixed at 512K bytes.
Fig. 3.5.2.4 Memory map for the expanded
512K maximum mode
There is an explanation on how all these settings
are actually made in "5.2 System Controller and Bus
Control" of this Manual.
27FFFFH
:
080000H
07FFFFH
010000H
00FFFFH
000000H
See Figure 3.2.1 for the internal memory
- MPU mode -
External
memory area
Internal memory
External
memory area
1FFFFFH
- MCU mode -
External
memory area
Internal memory
Unused area