M3885 datasheet(12/103 Pages) RENESAS

12 / 103 page

3885 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

MEMORY

RAM

RAM is used for data storage and for stack area of subroutine

calls and interrupts.

ROM

ROM is used for program code and data table storage.

The first 128 bytes and the last 2 bytes of ROM are reserved for

device testing code and the rest is user area. Programming/Eras-

ing of the reserved ROM area is possible in the flash memory

version.

Zero Page

Access to this area with only 2 bytes is possible in the zero page

addressing mode.

Special Page

Access to this area with only 2 bytes is possible in the special

page addressing mode.

Interrupt Vector Area

The interrupt vector area contains reset and interrupt vectors.

Special Function Register (SFR) Area

The special function register area contains the control registers

such as I/O ports, timers, serial I/O, etc.

Fig. 8 Memory map diagram

010016

000016

004016

FF0016

FFDC16

FFFE16

FFFF16

XXXX16

32768

49152

61440

800016

400016

100016

808016

408016

108016

YYYY16

ZZZZ16

RAM

ROM

1024

1536

2048

043F16

063F16

083F16

0FF016

0FFF16

SFR area

Not used

Interrupt vector area

Reserved ROM area

(Note) (128 bytes)

Zero page

Special page

RAM area

RAM size

(bytes)

Address

XXXX16

Reserved ROM area

(Note)

ROM area

ROM size

(bytes)

Address

YYYY16

Address

ZZZZ16

SFR area

Notes: This area is reserved in the mask ROM version.

This area is usable in flash memory version.

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