64
User’s Manual U11969EJ3V0UM00
CHAPTER 3 CPU FUNCTIONS
(4) External memory area
The
µ
PD703008, 70F3008, 703008Y, and 70F3008Y can use an area of up to xx100000H to xxFFDFFFH as
an external memory area in the single-chip mode.
The
µ
PD703006, 703008, 70F3008, 703008Y, and 70F3008Y can use an area of up to xx000000H to
xxFFDFFFH as an external memory area in the ROM-less mode.
In the external memory area, 64 K, 256 K, 1 M, 4 M, or 16 Mbytes of physical external memory can be allocated
when the external expansion mode is specified. The same image as that of the physical external memory
can be seen continuously on the external memory area, as shown in Figure 3-6, when the memory is not fully
expanded (to 16 Mbytes).
The internal RAM area, peripheral I/O area, and internal ROM area in single-chip mode are not subject to
external memory access.
Figure 3-6. External Memory Area (when expanded to 64 K, 256 K, or 1 Mbytes)
Note The image of the physical external memory can be seen continuously in the ROM-less mode or with
the
µ
PD703006.
XXFFFFFFH
XX000000H
Physical external memory
XFFFFH
X0000H
Peripheral I/O
Internal RAM
Image
Image
Image
Internal ROM
Note
XXFFDFFFH
XX100000H
External memory
Содержание V854 UPD703006
Страница 2: ...2 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 22: ...22 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 80: ...80 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 134: ...134 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 156: ...156 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 294: ...294 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 320: ...320 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 324: ...324 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 336: ...336 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 376: ...376 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 382: ...382 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 394: ...394 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 396: ...396 User s Manual U11969EJ3V0UM00 MEMO ...