Accessible Area In Each Mode - Renesas M16C/64A Series User Manual

M16C/64A Group
3.3

Accessible Area in Each Mode

Areas that can be accessed vary depending on processor mode and the status of each control bit. Figure
3.3 shows the Accessible Area in Each Mode.
In single-chip mode, the SFRs, internal RAM, and internal ROM can be accessed.
In memory expansion mode, the SFRs, internal RAM, internal ROM, and external areas can be accessed.
Address space is expandable to 4 MB with the memory area expansion function.
In microprocessor mode, the SFRs, internal RAM, and external areas can be accessed. Address space is
expandable to 4 MB with the memory area expansion function. Allocate ROM to the fixed vector table
from FFFDCh to FFFFFh.
Single-Chip Mode
00000h
00400h
Internal RAM
Reserved area
0D000h
0D800h
Reserved area
0E000h
Internal ROM
10000h
Internal ROM
(program ROM 2)
14000h
Reserved area
Internal ROM
(program ROM 1)
FFFFFh
Notes:
1. Do not access reserved areas.
2. The figure above applies under the following conditions:
Single-chip mode and memory expansion mode
- The PM10 bit in the PM1 register is 1
(addresses 0E000h to 0FFFFh are used as data flash)
- The PRG2C0 bit in the PRG2C register is 0 (program ROM 2 enabled)
- The PM13 bit in the PM1 register is 1
(all areas in internal RAM, and the program ROM 1 area from 80000h are usable)
Microprocessor mode
- The PM10 bit is 0 (addresses 0E000h to 0FFFFh are used as the CS2 area)
- The PRG2C0 bit is 1 (program ROM 2 disabled)
Figure 3.3 Accessible Area in Each Mode
R01UH0136EJ0210 Rev.2.10
Jul 31, 2012
00000h
SFR
00400h
0D000h
SFR
0D800h
0E000h
(data flash)
10000h
14000h
27000h
28000h
80000h
FFFFFh
Memory Expansion Mode
SFR
Internal RAM
Reserved area
SFR
External area
Internal ROM
(data flash)
Internal ROM
(program ROM 2)
External area
Reserved area
External area
Reserved area
Internal ROM
(program ROM 1)
3. Address Space
Microprocessor Mode
00000h
SFR
00400h
Internal RAM
Reserved area
0D000h
SFR
0D800h
External area
27000h
Reserved area
28000h
External area
FFFFFh
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