M16CSLASH62 datasheet(530/621 Pages) RENESAS

530 / 621 page

External Buses

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

515

5.3.3 Memory Space Expansion Mode 2

In memory space extension mode 2, the maximum 1 Mbyte of memory space accessible in normal mode

is extended to 4 Mbytes. The extended area consists of a 512 Kbytes of area at addresses 4000016

______

through BFFFF16 selectable by CS0. With this area comprising one bank, a total of seven banks from

bank 0 to bank 6 can be used exclusively for data access.

Figure 5.3.4. Memory Map in Memory space expansion mode 2

0000016

0040016

FFFFF16

D000016

0800016

Memory expansion mode

SFR area

Internal RAM area

External area

Internal ROM area

Internal area reserved

2800016

4000016

0400016

CS3

CS2

CS1

CS0 area

expand

Data exclusive area

Microprocessor mode

SFR area

Internal RAM area

External area

Internal area reserved

0000016

0040016

FFFFF16

0800016

CS3

CS2

CS1

CS0

2800016

4000016

0400016

The bank to use is selected by a

bank select bit.

program/data area

Bank 7

Bank 6

4000016

7FFFF16

BFFFF16

Data exclusive area

The bank to use is selected by a

bank select bit.

program/data area

4000016

7FFFF16

Bank 7

C000016

FFFFF16

Bank 7

Bank 6

4000016

BFFFF16

CS0 area

expand

In memory expansion mode, in addition to the seven banks from bank 0 to bank 6, another bank, bank 7,

comprised of a 256 Kbytes of area from address 4000016 to address 7FFFF16 can be used. In micropro-

cessor mode, in addition to the seven banks from bank 0 to bank 6, another bank, bank 7, comprised of

a 256 Kbytes of area from address C000016 to address FFFFF16 can be used. Programs and data can be

placed in bank 7.

To choose each bank, use the Data bank register’s bank select bits (bits 3, 4, and 5 at address 0000B16).

_______

When accessing this extended area for data, the device outputs a chip select signal from the CS0 pin and

______

a bank number from the CS1, CS2, and CS3 pins each that has been set by the bank select bits.

When fetching a program from the area of bank 7 comprised of addresses 4000016 through 7FFFF16, the

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