Operations; 1-Mb Mode - Renesas M16C/64C User Manual

M16C/64C Group
12.3

Operations

12.3.1

1-MB Mode

In 1-MB mode, the memory space is 1 MB. The external area to be accessed is specified using the CSi
signals.
00000h
00400h
XXXXXh
04000h
08000h
0D000h
0D800h
0E000h
10000h
14000h
27000h
28000h
30000h
D0000h
YYYYYh
FFFFFh
Notes:
1. When the PM13 bit in the PM1 register is 0, 15 KB of the internal RAM and 192 KB of the internal ROM can
be used. See the table below for addresses XXXXXh and YYYYYh.
Capacity
12 KB
20 KB
31 KB
2. When the PM10 bit is 0, this area is used as an external area; when the bit is 1, this area is used as internal
ROM (data flash).
3. When the PRG2C0 bit in the PRG2C register is 1, this area is used as an external area; when the bit is 0,
this area is used as internal ROM (program ROM 2).
4. When the PM10 bit is 0, this area is used as an external area; when the bit is 1, this area is used as a
reserved area.
5. When the PRG2C0 bit in the PRG2C register is 1, this area is used as an external area; when the bit is 0,
this area is used as a reserved area.
Memory Mapping and CS Areas in 1-MB Mode (PM13 = 0)
Figure 12.1
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
Memory expansion mode
SFR
(1)
Internal RAM
Reserved area
SFR
(2)
Data flash
(3)
Program ROM 2
Reserved area
External area
Reserved area
(1)
Program ROM 1
Internal RAM
Address XXXXXh
033FFh
03FFFh
03FFFh
12. Memory Space Expansion Function
Microprocessor mode
SFR
(1)
Internal RAM
Reserved area
SFR
(4)
Reserved, external area
(5)
Reserved, external area
Reserved area
External area
Program ROM 1
Capacity Address YYYYYh
128 KB E0000h
256 KB D0000h
384 KB D0000h
512 KB D0000h
CS3 (16 KB)
CS2
CS1 (32 KB)
CS0
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