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MB90435 Series
19
I
MEMORY MAP
The memory space of the MB90435 Series is shown below.
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 address 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 48 Kbytes, and its entire image cannot be shown in bank 00.The image between FF4000
H
and
FFFFFF
H
is visible in bank 00, while the image between FF0000
H
and FF3FFF
H
is visible only in bank FF.
MB90V540G
FFFFFF
H
FEFFFF
H
FF0000
H
FDFFFF
H
FE0000
H
FCFFFF
H
FD0000
H
00FFFF
H
004000
H
003FFF
H
003900
H
0020FF
H
001FF5
H
001FF0
H
000100
H
0000BF
H
000000
H
FC0000
H
ROM
(FF bank)
ROM
(FE bank)
ROM
(FD bank)
ROM
(FC bank)
External
ROM
(Image of
FF bank)
Peripheral
External
RAM 8 K
External
Peripheral
ROM correction
MB90F438L (S)/438L (S)
FFFFFF
H
FEFFFF
H
FF0000
H
FE0000
H
00FFFF
H
004000
H
003FFF
H
003900
H
002000
H
0010FF
H
000100
H
0000BF
H
000000
H
ROM
(FF bank)
ROM
(FE bank)
External
ROM
(Image of
FF bank)
Peripheral
External
RAM 4 K
External
Peripheral
MB90F439 (S) /439 (S)
FDFFFF
H
FCFFFF
H
FD0000
H
FC0000
H
ROM
(FD bank)
ROM
(FC bank)
FFFFFF
H
FEFFFF
H
FF0000
H
FE0000
H
00FFFF
H
004000
H
003FFF
H
003900
H
002100
H
0018FF
H
000100
H
0000BF
H
000000
H
ROM
(FF bank)
ROM
(FE bank)
External
ROM
(Image of
FF bank)
Peripheral
External
RAM 6 K
External
Peripheral
FFFFFF
H
FF0000
H
00FFFF
H
004000
H
003FFF
H
003900
H
002000
H
0008FF
H
000100
H
0000BF
H
ROM
(FF bank)
ROM
(Image of
FF bank)
Peripheral
External
RAM 2 K
External
Peripheral
MB90F437L (S)*
000000
H
External
* : Under development