MB90487PF 查看數據表（PDF） - Fujitsu

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MB90487PF

16-bit Proprietary Microcontroller

Fujitsu 

MB90480/485 Series

s MEMORY MAP

FFFFFFH

Address #1

Single chip

ROM area

Internal ROM

external bus

ROM area

External ROM

external bus

010000H

Address #2

ROM area

FF bank image

ROM area

FF bank image

*

Address #3

RAM Register

RAM Register

RAM Register

000100H

0000D0H

000000H

Peripheral

: internal

Peripheral

: External

Peripheral

: Access inhibited

* : In models where address #3 overlaps with address #2, this external area does not exist.

Model

Address #1

Address #2

Address #3

MB90F481

FC0000H *

001100H

MB90F482

MB90487

MB90F488

MB90V480

FC0000H

FD0000H

FC0000H

(FC0000H)

004000H or 008000H,

selected by the MS bit in

the ROMM register

001900H

002900H

002900H

004000H

MB90V485

(FC0000H)

004000H

* : No memory cells from FC0000H to FC7FFFH and FE0000H to FE7FFFH.

The upper part of the 00 bank is set up to mirror the image of FF bank ROM, to enable efficient use of small

model C compilers. Because the lower 16-bit address of the FF bank and the lower 16-bit address of the 00

bank is the same, enabling reference to tables in ROM without the “far” pointer declaration.

For example, in accessing address 00C000H it is actually the contents of ROM at FFC000H that are accessed.

If the MS bit in the ROMM register is set to “0”, the ROM area in the FF bank will exceed 48 K bytes and it is

not possible to reflect the entire area in the image in the 00 bank. Therefore the image from FF4000H to FFFFFFH

is reflected in the 00 bank and the area from FF0000H to FF3FFFH can be seen in the FF bank only.

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