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CHAPTER 23 EXTERNAL DEVICE EXPANSION FUNCTION
Figure 23-1. Memory Map when Using External Device Expansion Function (2/2)
(b) Memory map of
µ
PD78078, 78078Y, 78P078, (c) Memory map of
µ
PD78078, 78078Y and of
78P078Y when internal ROM capacity (PROM)
µ
PD78P078, 78P078Y when internal PROM
is 56 Kbytes capacity is 60 Kbytes
Caution When the internal ROM (PROM) size is 60 Kbytes, the area from F000H to F3FFH cannot be used.
F000H to F3FFH can be used as external memory by setting the internal ROM size to less than
56 Kbytes by the internal memory size switching register (IMS).
SFR
Internal High-Speed RAM
FF00H
FEFFH
FB00H
FAFFH
FAE0H
FADFH
FAC0H
FABFH
F800H
F7FFH
F400H
F3FFH
F000H
EFFFH
E100H
E0FFH
E000H
DFFFH
0000H
Reserved
Buffer RAM
Reserved
Internal Expansion RAM
Full-Address Mode
(when MM2 to MM0 = 111)
or
16-Kbyte Expansion Mode
(when MM2 to MM0 = 101)
4-Kbyte Expansion Mode
(when MM2 to MM0 = 100)
256-byte Expansion Mode
(when MM2 to MM0 = 011)
Single-chip Mode
FFFFH
SFR
Internal High-Speed RAM
FF00H
FEFFH
FB00H
FAFFH
FAE0H
FADFH
FAC0H
FABFH
F800H
F7FFH
F400H
F3FFH
F000H
EFFFH
0000H
Reserved
Buffer RAM
Reserved
Internal Expansion RAM
Single-chip Mode
Reserved
FFFFH