M16C62_N Datasheet, PDF (530/621 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY

External Buses
Mitsubishi microcomputers
M16C / 62 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
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
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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.
Memory expansion mode
0000016
0040016
SFR area
Internal RAM area
0400016
0800016
Internal area reserved
CS3
CS2
2800016
4000016
CS1
External area
D000016
Internal area reserved
The bank to use is selected by a
bank select bit.
program/data area
CS0 area
expand
4000016
7FFFF16
Bank 7
BFFFF16 ^{Bank 6}
543210
FFFFF16
Internal ROM area
Data exclusive area
Microprocessor mode
0000016
0040016
SFR area
Internal RAM area
0400016
0800016
Internal area reserved
CS3
CS2
2800016
4000016
CS1
External area
CS0
FFFFF16
The bank to use is selected by a
bank select bit.
program/data area
CS0 area
expand
4000016
7FFFF16
Bank 7
Bank 6
C000016
FFFFF16
Bank 7
4000016
543210
BFFFF16
Data exclusive area
Figure 5.3.4. Memory Map in Memory space expansion mode 2
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).
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When accessing this extended area for data, the device outputs a chip select signal from the CS0 pin and
______ ______
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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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