NEC PD78P078 User Manual

529

CHAPTER 23 EXTERNAL DEVICE EXPANSION FUNCTION

Memory maps when using the external device expansion function are as follows.

Figure 23-1. Memory Map when Using External Device Expansion Function (1/2)

(a)

Memory map of

PD78076, 78076Y,

and of

PD78P078, 78P078Y when

internal PROM capacity is 48 Kbytes

FFFFH

SFR

Internal High-Speed RAM

FF00H
FEFFH

FB00H
FAFFH

FAE0H
FADFH

FAC0H
FABFH

F800H
F7FFH

F400H
F3FFH

D000H
CFFFH

C100H
C0FFH

C000H
BFFFH

0000H

Reserved

Buffer RAM

Reserved

Internal Expansion RAM

Full-Address Mode

(when MM2 to MM0 = 111)

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