M16C30P_07 Datasheet, PDF (59/317 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/30 SERIES

M16C/30P Group
8. Memory Space Expansion Function
8. Memory Space Expansion Function
The following describes a memory space extension function.
During memory expansion or microprocessor mode, the memory space expansion function allows the access space to
be expanded using the appropriate register bits.
8.1 1-Mbyte Mode
In this mode, the memory space is 1 Mbyte. In 1-Mbyte mode, the external area to be accessed is specified using
the CSi (i = 0 to 3) signals (hereafter referred to as the CSi area). Figure 8.1 and 8.2 show Memory Map and CS
area. Refer to Figure 8.1 for models without the PM13 bit. See Figure 6.2 PM1 Register (1) and Figure 6.3 PM1
Register (2) to check presence or absence of the PM13 bit.
Memory expansion mode
00000h
00400h
SFR
Internal RAM
04000h
08000h
10000h
27000h
28000h
30000h
Reserved area
Reserved, External area ⁽¹⁾
Reserved area
External area
Microprocessor mode
SFR
Internal RAM
Reserved area
Reserved, External area ⁽¹⁾
Reserved area
External area
CS3 (16 Kbytes)
CS2 (PM10=0 : 124 Kbytes)
CS2 (PM10=1 : 92 Kbytes)
CS1 (32 Kbytes)
CS0 (Memory expansion mode:640 Kbytes )
D0000h
Reserved area
CS0 (Microprocessor mode:832 Kbytes)
FFFFFh
Internal ROM
PM13=0
Internal RAM
Internal ROM
Size Address XXXXXh
Size Address YYYYYh
5 Kbytes
017FFh
96 Kbytes
E8000h
6 Kbytes
01BFFh
128 Kbytes E0000h
12 Kbytes
033FFh
160 Kbytes D8000h
192 Kbytes D0000h
256 Kbytes
D0000h⁽²⁾
CS0
Memory expansion mode
30000h to CFFFFh
Microprocessor mode
30000h to FFFFFh
External Area
CS1
CS2
28000h to When PM10=0
2FFFFh ^{08000h to 26FFFh}
When PM10=1
10000h to 26FFFh
CS3
04000h to
07FFFh
NOTES :
1. For flash memory version, when the PM10 bit in the PM1 register is set to “1”, 0F000h to 0FFFFh can be used as internal ROM area.
For mask ROM version and one-time flash version, set the PM10 bit to "0" (08000h to 26FFFh for CS area).
2. 192-Kbyte internal ROM space is available for use.
Figure 8.1 Memory Mapping and CS Area in 1-Mbyte mode (PM13=0)
Rev.1.22 Mar 29, 2007 Page 43 of 291
REJ09B0179-0122