
19
MB90570 Series
s MEMORY MAP
Note: The ROM data of bank FF is reflected in the upper address of bank 00, realizing effective use of the C compiler
small model. The lower 16-bit of bank FF and the lower 16-bit of bank 00 is assigned to the same address,
enabling reference of the table on the ROM without stating “far”.
For example, if an attempt has been made to access 00C000H, the contents of the ROM at FFC000H are
accessed actually. Since the ROM area of the FF bank exceeds 48 Kbytes, the whole area cannot be reflected
in the image for the 00 bank. The ROM data at FF4000H to FFFFFFH looks, therefore, as if it were the image
for 00400H to 00FFFFH. Thus, it is recommended that the ROM data table be stored in the area of FF4000H
to FFFFFFH.
Part number
Address #1*
Address #2*
Address #3*
MB90573
FE0000H
004000H
001800H
MB90574/B
FC0000H
004000H
002900H
MB90F574/A
FC0000H
004000H
002900H
FFFFFFH
Address #1
FC0000H
010000H
Address #2
Address #3
000100H
0000C0H
000000H
ROM area
(image of
bank FF)
ROM area
(image of
bank FF)
RAM
Register
Peripheral
Internal ROM
external bus mode
A mirror function
is supported.
External ROM
external bus mode
: Internal access memory
: External access memory
*: Addresses #1, #2 and #3 are unique to the product type.
: Inhibited area
004000H
Single chip mode
A mirror function is
supported.