CHAPTER 3 CPU FUNCTIONS
User’s Manual U15109EJ3V0UD
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(4) External memory
The V850/SC1, V850/SC2, and V850/SC3 can use an area of up to 16 MB (xx100000H to xxFF7FFFH) for
external memory accesses (in single-chip mode: external expansion).
64 KB, 256 KB, 1 MB, or 4 MB of physical external memory can be allocated when the external expansion mode
is specified. In other than the physical external memory area, images of the physical external memory can be
seen.
The internal RAM area and on-chip peripheral I/O area are not subject to external memory access.
Caution
Addresses xxnFF800H to xxnFFFFFH (n = 3, 7, B) constitute an access-prohibited area because
this is an FCAN address area.
Figure 3-10. External Memory Area (When Expanded to 64 KB, 256 KB, or 1 MB)
xxFFFFFFH
xx000000H
Physical external memory
xFFFFH
x0000H
On-chip peripheral I/O
Internal RAM
Image
Image
Image
Internal ROM
xxFF7FFFH
xx100000H
External memory