
MB90390 Series
22
■
MEMORY MAP
Note : The high-order portion of bank 00 gives the image of the FF bank ROM to make the small model of the C
compiler effective. Since the low-order 16 bits are the same, the table in ROM can be referenced without
using the far specification in the pointer declaration.
For example, an attempt to access 00C000
H
accesses the value at FFC000
H
in ROM.
The ROM area in bank FF exceeds 32/48 Kbytes, and its entire image cannot be shown in bank 00.
The image between FF4000
H
/FF8000
H
and FFFFFF
H
is visible in bank 00, while the image between FF0000
H
and FF3FFF
H
/FF7FFF
H
is visible only in bank FF.
In MB90V390H/HA/HB, the image for only ROM data between FF8000
H
to FFFFFF
H
is visible in bank 00.
As for MB90F394H(A) and MB90394HA, it is possible to set the FF bank area which looks the 00 bank image
in the ROM mirror function select register (ROMM) .
RAM 12 Kbytes
RAM 4 Kbytes
FFFFFF
H
FF0000
H
FEFFFF
H
FE0000
H
FDFFFF
H
FD0000
H
FCFFFF
H
00FFFF
H
008000
H
0050FF
H
004100
H
003FFF
H
003500
H
0030FF
H
000100
H
0000BF
H
000000
H
FC0000
H
FBFFFF
H
FB0000
H
FAFFFF
H
FA0000
H
F9FFFF
H
F90000
H
F8FFFF
H
MB90V390H
FFFFFF
H
FF0000
H
FEFFFF
H
FE0000
H
FDFFFF
H
FD0000
H
FCFFFF
H
00FFFF
H
003FFF
H
003500
H
0028FF
H
000100
H
0000BF
H
000000
H
FC0000
H
FBFFFF
H
FB0000
H
FAFFFF
H
FA0000
H
F9FFFF
H
F90000
H
MB90394HA/
F394H(A)
or
004000
H
008000
H
RAM 12 Kbytes
FFFFFF
H
FF0000
H
FEFFFF
H
FE0000
H
FDFFFF
H
FD0000
H
FCFFFF
H
00FFFF
H
003FFF
H
003500
H
0030FF
H
000100
H
0000BF
H
000000
H
FC0000
H
FBFFFF
H
FB0000
H
FAFFFF
H
F8FFFF
H
F80000
H
F90000
H
MB90V390HA/HB
008000
H
0070FF
H
004100
H
8017FF
H
800000
H
F80000
H
Periperal
Periperal
Periperal
Periperal
RAM 10 Kbytes
Periperal
Periperal
ROM (FF bank)
ROM (FE bank)
ROM (FD bank)
ROM (FB bank)
ROM (FA bank)
ROM (F9 bank)
ROM (Image of
FF bank)
ROM (FF bank)
ROM (FE bank)
ROM (FD bank)
ROM (FB bank)
ROM (FA bank)
ROM (F9 bank)
ROM (Image of
FF bank)
ROM (FC bank)
ROM (FF bank)
ROM (FE bank)
ROM (FD bank)
ROM (FB bank)
ROM (FA bank)
ROM (F9 bank)
ROM (Image of
FF bank)
ROM (FC bank)
ROM (F8 bank)
RAM 6 Kbytes
ROM (F8 bank)
RAM 12 Kbytes
FA0000
H
F9FFFF
H