M30620ECFS datasheet(21/276 Pages) MITSUBISHI

21 / 276 page

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Memory Space Expansion Functions

Memory Space Expansion Features

Here follows the description of the memory space expansion function.

With the processor running in memory expansion mode or in microprocessor mode, the memory space

expansion features provide the means of expanding the accessible space. The memory space expansion

features run in one of the three modes given below.

(1) Normal mode (no expansion)

(2) Memory space expansion mode 1 (to be referred as expansion mode 1)

(3) Memory space expansion mode 2 (to be referred as expansion mode 2)

Use bits 5 and 4 (PM15, PM14) of processor mode register 1 to select a desired mode. The external

memory area the chip select signal indicates is different in each mode so that the accessible memory space

varies. Table 1.8.1 shows how to set individual modes and corresponding accessible memory spaces. For

external memory area the chip select signal indicates, see Table 1.12.1 on page 33.

Table 1.8.1. The way of setting memory space expansion modes and corresponding memory spaces

Expansion mode

How to set PM15 and PM14

Accessible memory space

Normal mode (no expansion)

0, 0

Up to 1M byte

Expansion mode 1

1, 0

Up to 1.2M bytes

Expansion mode 2

1, 1

Up to 4M bytes

Here follows the description of individual modes.

(1) Normal mode (a mode with memory not expanded)

‘Normal mode’ means a mode in which memory is not expanded.

Figure 1.8.1 shows the memory maps and the chip select areas in normal mode.

Figure 1.8.1. The memory maps and the chip select areas in normal mode

Microprocessor mode

SFR area

Internal RAMarea

External area

Internal area reserved

0000016

0040016

XXXXX16

YYYYY16

FFFFF16

D000016

Note 1: These memory maps show an instance in which PM13 is set to 0; but in the case of M30624MG/FG, they show an

instance in which PM13 is set to 1.

Note 2: The memory maps in single-chip mode are omitted.

0800016

Memory expansion mode

SFR area

Internal RAM area

External area

Internal ROM area

Internal area reserved

CS3 (16K bytes)

CS2 (128K bytes)

CS1 (32K bytes)

CS0

Memory expansion mode: 640K bytes

Microprocessor mode: 832K bytes

2800016

3000016

0400016

Normal mode (memory area = 1M bytes for PM15 = 0, PM14 = 0)

M30622M4

00FFF16

F800016

C000016

053FF16

M30624MG/FG

M30620M8

02BFF16

F000016

E800016

017FF16

M30622MA

E000016

017FF16

M30622MC

M30620MA

E800016

02BFF16

M30622M8/E8

F000016

013FF16

Address XXXXX16

Type No.

Address YYYYY16

M30620MC/EC

E000016

02BFF16

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