MB89925 datasheet(18/46 Pages) FUJITSU

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MB89920 Series

s CPU CORE

1. Memory Space

The microcontrollers of the MB89920 series offer a memory space of 64 Kbytes for storing all of I/O, data, and

program areas. The I/O area is located at the lowest address. The data area is provided immediately above the

I/O area. The data area can be divided into register, stack, and direct areas according to the application. The

program area is located at exactly the opposite end, that is, near the highest address. Provide the tables of

interrupt reset vectors and vector call instructions toward the highest address within the program area. The

memory space of the MB89920 series is structured as illustrated below.

Memory Space

ROM

FFFFH

0080H

0000H

I/O

MB89923

E000H

0100H

FFFFH

0080H

0000H

I/O

0100H

FFFFH

0080H

0000H

I/O

0100H

0200H

0480H

RAM

0200H

0180H

0280H

Not available

C000H

4000H

Program ROM

ROM

Not available

FFFFH

0080H

0000H

I/O

0100H

0200H

0480H

RAM

4000H

Program ROM

Not available

MB89925

MB89P928

MB89PV920

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