MB90F474LPF datasheet(20/118 Pages) FUJITSU

20 / 118 page

MB90470 Series

s MEMORY MAP

* : In models where address 2# coincides with 004000H, there is no external area.

The image of FF bank ROM is reflected in the top of the 00 bank, for greater efficiency in using the C compiler

for small models. The lower 16-bit address on the FF bank is the same as the lower 16-bit address on the 00

bank, so that it is possible to reference tables in ROM without using the pointer for a far specification.

For example, when accessing 00C000H, it is actually the content of ROM at FFC000H that is accessed. Here,

because the ROM area on the FF bank exceeds 48 KB, it is not possible to view the entire area in the image on

the 00 bank. Therefore, the image from FF4000H to FFFFFFH is visible on the 00 bank, and FF0000H to FF3FFFH

is visible only on the FF bank.

Model

Address 1#

Address 2#

MB90473

FE0000H

002900H

MB90474

FC0000H

004000H

MB90477/478

FC0000H

002100H

MB90F474

FC0000H

004000H

MB90V470

(FC0000H)

004000H

FFFFFFH

Address 1#

Address 2#

010000H

004000H

000100H

0000D0H

000000H

: Internal

: External

: Access not available

RAM

Single chip

Internal ROM external bus

ROM area

FF bank image

ROM area

FF bank image

External ROM external bus

Peripheral

RAM

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