NEC PD78056F and 78056FY, and of the, PD78P058F and 78P058FY when the internal PROM is 48 Kbytes.

506
CHAPTER 22 EXTERNAL DEVICE EXPANSION FUNCTION
Memory maps when using the external device expansion function are as follows.
Figure 22-1. Memory Map When Using External Device Expansion Function (1/2)
(a) Memory Map of the
µ PD78056F and 78056FY, and of the
µ PD78P058F and 78P058FY when the internal PROM is 48 Kbytes.
FFFFH
SFR
Internal High-Speed RAM
FF00H
FEFFH
FB00H
FAFFH
FAE0H
FADFH
FAC0H
FABFH
FA80H
FA7FH
D000H
CFFFH
C100H
C0FFH
C000H
BFFFH
0000H
Reserved
Internal Buffer RAM
Reserved
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)
Single-chip Mode
256-byte Expansion Mode
(when MM2 to MM0 = 011)