M30622ECTFP datasheet(22/184 Pages) MITSUBISHI

22 / 184 page

Tentative Specifications REV.A

Mitsubishi microcomputers

M16C / 62T Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Specifications in this manual are tentative and subject to change.

Under

development

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.

But M30623 (80-pin package) is not provided with the output pin for the chip select signal. And, the M16C/62T group

is not guaranteed to operate in memory expansion and microprocessor modes.

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

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)

Type No.

XXXXX16 YYYYY16

M30623M4T-XXXGP

M30622M8T/M8V-XXXFP

M30623M8T/M8V-XXXGP

M30622MCT/MCV-XXXFP

M30623MCT/MCV-XXXGP

00FFF16

F800016

013FF16

F000016

017FF16

E000016

Note 1. M30623(80-pin package) is not provided with the output pins for chip select signals.

Note 2. The M16C/62T group is not guaranteed to operatein memory expansion and microprocessor modes.

Note 3. The memory maps in single-chip mode are omitted.

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