MB90455 데이터 시트보기 (PDF) - Fujitsu

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MB90455

16-bit Proprietary Microcontroller

Fujitsu 

MB90455 Series

s MEMORY MAP

MB90455 series allows specifying a memory access mode “single chip mode.”

1. Memory allocation of MB90455

MB90455 series model has 24-bit wide internal address bus and up to 24-bit bus of external address bus.

A maximum of 16 Mbyte memory space of external access memory is accessible.

2. Memory map

(with ROM mirroring

function available)

000000H

0000C0H

000100H

Peripheral

RAM area

Address #1*1

Register

(with ROM mirroring

function not available)

Peripheral

RAM area

Register

003800H

004000H

010000H

FE0000H

FF0000H

Address #2*1

FFFFFFH

Extension IO

area

ROM area

(FF bank image)

ROM area*2

ROM area

Extension IO

area

ROM area*2

ROM area

Product

MB90F455 (S) /455 (S)

MB90F456 (S) /456 (S)

MB90F457 (S) /457 (S)

MB90V495G

Address #1*1

000900H

000900H

000900H

001900H

Address #2*1

FFA000H

FF8000H

FF0000H



: Internal access memory

: Access disallowed

*1 : Addresses #1 and #3 are product-specific.

*2 : On MB90F455 (S) /F456 (S) /F457 (S) , 455 (S) /456 (S) /457 (S) , to read “FE0000H” to

“FEFFFFH” is to read out “FF0000H” to “FFFFFFH”.

Note : When internal ROM is operating, F2MC-16LX allows viewing ROM data image on FF bank at upper-level of

00 bank. This function is called “mirroring ROM,” which allows effective use of C compiler small model.

F2MC-16LX assigns the same low order 16-bit address to FF bank and 00 bank, which allows referencing

table in ROM without specifying “far” using pointer.

For example, when accessing to “00C000H”, ROM data at “FFC000H” is accessed actually. However, because

ROM area of FF bank exceeds 48 Kbytes, viewing all areas is not possible on 00 bank image. Because ROM

data of “FF4000H” to “FFFFFFH” is viewed on “004000H” to “00FFFFH” image, store a ROM data table in area

“FF4000H” to “FFFFFFH.”

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