MB91F128 datasheet(13/50 Pages) FUJITSU

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MB91F127/F128

s CPU CORE MEMORY SPACE

• MB91F127

0000 0000H

0000 0400H

0000 0800H

0000 1000H

0000 4000H

0001 0000H

FFFF FFFFH

0001 0000H

0008 0000H

0008 0800H

0010 0000H

FFFF FFFFH

I/O

FLASH ROM

256 KB

FLASH ROM

256 KB

000C 0000H

External ROM

External bus mode

Internal ROM

External bus mode

Single-chip mode

Access inhibit

Internal RAM

12 KB

Access inhibit

External area

Access inhibit

Internal RAM

12 KB

Access inhibit

Internal RAM

12 KB

Access inhibit

External area

Internal RAM

2 KB

Internal RAM

2 KB

Access inhibit

Direct

addressing

areas

I/O map

External area

Access inhibit

Note : External area is not accessible in single-chip mode. When accessing to external areas, select the internal

ROM external bus mode in mode register.

Direct addressing areas

The areas described below are used for I/O processes. The areas, referred to as “direct addressing areas,”

allow specifying an operand address directly by an instruction. The direct addressing areas varies as the

following, depending on size of the data to be accessed.

• Byte-data access : 0 to 0FFH

• Half-word data access : 0 to 1FFH

• Word-data access : 0 to 3FFH

Access inhibit

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