M16C62_N Datasheet, PDF (529/621 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY

External Buses
Mitsubishi microcomputers
M16C / 62 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
5.3.2 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.
Memory expansion mode Microprocessor mode
0000016
0040016
SFR area
Internal RAM area
0400016
0800016
Internal area reserved
CS3
CS2
2800016
3000016
CS1
External area
CS0
SFR area
Internal RAM area
Internal area reserved
CS3
CS2
CS1
External area
CS0
D000016
Internal area reserved
FFFFF16
Internal ROM area
Program exclusive area
176K bytes
area of memory
expanded
program/data area
CS0 area
32K bytes
CS1 area
128K bytes
CS2 area
16K bytes
CS3 area
Data exclusive area
Figure 5.3.3. Memory Map in Memory space expansion mode 1
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.
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