M16C64A_15 Datasheet, PDF (17/92 Pages) Renesas Technology Corp – RENESAS MCU

M16C/64A Group
3. Address Space
3. Address Space
3.1 Address Space
The M16C/64A Group has a 1 MB address space from 00000h to FFFFFh. Address space is expandable to
4 MB with the memory area expansion function. Addresses 40000h to BFFFFh can be used as external
areas from bank 0 to bank 7. Figure 3.1 shows the Address Space. Areas that can be accessed vary
depending on processor mode and the status of each control bit.
1 MB
address space
Memory expansion mode
00000h
00400h
SFR
Internal RAM
The internal RAM is allocated
from address 00400h higher.
04000h
0D000h
0D800h
0E000h
10000h
14000h
27000h
28000h
Reserved area
External area
SFR
External area
Internal ROM
(data flash)
Internal ROM
(program ROM 2)
External area
Reserved area
When data flash is enabled
When program ROM 2
is enabled
In 4 MB mode
Bank 7
Bank 6
Bank 5
Bank 4
Bank 3
Bank 2
40000h
Bank 1
External area
Bank 0
D0000h
Reserved area
BFFFFh
512 KB × 8
FFFFFh
Internal ROM
(program ROM 1)
Program ROM 1 is allocated from
address FFFFFh lower.
Notes:
1. Do not access reserved areas.
2. The figure above applies under the following condition:
- The PM13 bit in the PM1 register is 0
(addresses 04000h to 0CFFFh and 80000h to CFFFFh are used as external areas)
Figure 3.1 Address Space
R01DS0032EJ0200 Rev.2.00
Feb 07, 2011
Page 17 of 88