Memory Map When Using External Device Expansion Function - NEC PD78076 User Manual

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

Table of Contents

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

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