M30620ECFS datasheet(529/621 Pages) RENESAS

529 / 621 page

External Buses

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

514

5.3.2 Memory Space Expansion Mode 1

In memory space extension mode 1, the accessible area is extended to the memory space that can be

accessed in normal mode plus 176 Kbytes. This 176-Kbyte area ranges from address 0400016 to ad-

dress 2FFFF16.

Figure 5.3.3. Memory Map in Memory space expansion mode 1

Microprocessor mode

SFR area

Internal RAM area

External area

Internal area reserved

0000016

0040016

FFFFF16

D000016

0800016

Memory expansion mode

SFR area

Internal RAM area

External area

Internal ROM area

Internal area reserved

CS3

CS2

CS1

CS0

2800016

3000016

0400016

CS3

CS2

CS1

CS0

Program exclusive area

176K bytes

area of memory

expanded

program/data area

CS0 area

Data exclusive area

CS1 area

CS2 area

CS3 area

32K bytes

128K bytes

16K bytes

When fetching a program from the area consisting of these addresses 0400016 through 2FFFF16, the

______

CPU reads program code from memory locations selected by the CS0 chip select signal. Also, when

______

accessing this area for data, the CPU accesses memory locations selected by the CS1, CS2, or CS3 chip

select signal.

In areas following address 3000016, for both program fetch and data access, the CPU accesses memory

______

locations selected by the CS0 chip select signal.

M30620ECFS Datasheet(PDF) 529 Page - Renesas Technology Corp

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