NEC PD78076 User Manual page 530

Pd78078 series; pd78078y series 8-bit single-chip microcontrollers

Table of Contents

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

(b) Memory map of PD78078, 78078Y, 78P078,

78P078Y when internal ROM capacity (PROM)

is 56 Kbytes

Internal High-Speed RAM

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

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).

CHAPTER 23 EXTERNAL DEVICE EXPANSION FUNCTION

PD78P078, 78P078Y when internal PROM

capacity is 60 Kbytes

Internal High-Speed RAM

Internal Expansion RAM

Single-chip Mode