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CHAPTER 2 CPU
2.3
Memory Space Map
The memory space of the MB90390 Series is shown in Figure 2.3-1.
■ Memory Space Map
The ROM data in the high-order portion of FF-bank can be seen as an image in the higher 00-bank in order
to support the small model C compiler. Since the low-order 16 bits are identical, this part of the ROM data
can be referenced without using the far specification in the pointer declaration.
For example, when "00C000
the ROM area in the FF bank exceeds 48 KBytes (resp. 32 KBytes for MB90V390H/MB90V390HA/
MB90V390HB), its entire image cannot be mirrored in the 00 bank.
On MB90394HA/MB90F394H(A), the image between "FF4000
in bank 00, whereas the data between "FF0000
On MB90V390H/MB90V390HA/MB90V390HB, the image between "FF8000
bank 00, whereas the data between "FF0000
*: Can be selected by MS bit in ROM register (see Section "27.2 ROM Mirroring Register (ROMM)").
30
" is accessed, the contents of ROM at "FFC000
H
" to "FF3FFF
H
" to "FF7FFF
H
" are read. However, since
H
" / "FF8000
"* to "FFFFFF
H
H
" / "FF7FFF
"* is only visible in bank FF.
H
H
" to "FFFFFF
H
" is only visible in bank FF.
H
" is visible
H
" is visible in
H
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