MB90520 データシートの表示（PDF） - Fujitsu

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MB90520

16-bit Proprietary Microcontroller

Fujitsu 

MB90520 Series

s MEMORY MAP

Single chip mode

A mirroring function

is supported.

FFFFFFH

ROM area

Address #1

FE0000H

010000H

Address #2

ROM area

(image of

bank FF)

004000H

002000H

Address #3

000100H

0000C0H

000000H

RAM Register

Peripheral

Part number

MB90522

MB90523

MB90F523

Address #1*

FF0000H

FE0000H

FE0000H

Address #2 *

004000H

004000H

004000H

: Internal access memory

: Access prohibited

*: Addresses #1, #2 and #3 vary with product type.

Address #3 *

001100H

001100H

001100H

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 are 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

actually accessed. Since the ROM area of the FF bank exceeds 48k bytes, 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.

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