3820 datasheet(29/349 Pages) RENESAS

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3820 GROUP USER’S MANUAL

1-12

MITSUBISHI MICROCOMPUTERS

3820 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MEMORY

Special Function Register (SFR) Area

The Special Function Register area in the zero page contains con-

trol registers such as I/O ports and timers.

RAM

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

calls and interrupts.

ROM

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

device testing and the rest is user area for storing programs.

Interrupt Vector Area

The interrupt vector area contains reset and interrupt vectors.

Zero Page

The 256 bytes from addresses 000016 to 00FF16 are called the

zero page area. The internal RAM and the special function regis-

ters (SFR) are allocated to this area.

The zero page addressing mode can be used to specify memory

and register addresses in the zero page area. Access to this area

with only 2 bytes is possible in the zero page addressing mode.

Special Page

The 256 bytes from addresses FF0016 to FFFF16 are called the

special page area. The special page addressing mode can be

used to specify memory addresses in the special page area. Ac-

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

addressing mode.

Fig. 9 Memory map diagram

010016

000016

004016

044016

FF0016

FFDC16

FFFE16

FFFF16

192

256

384

512

640

768

896

1024

XXXX16

00FF16

013F16

01BF16

023F16

02BF16

033F16

03BF16

043F16

4096

8192

12288

16384

20480

24576

28672

32768

F00016

E00016

D00016

C00016

B00016

A00016

900016

800016

F08016

E08016

D08016

C08016

B08016

A08016

908016

808016

YYYY16

ZZZZ16

RAM

ROM

005416

Reserved area

SFR area

Not used

Interrupt vector area

ROM area

Reserved ROM area

(128 bytes)

Zero page

Special page

RAM area

RAM size

(bytes)

Address

XXXX16

ROM size

(bytes)

Address

YYYY16

LCD display RAM area

Address

ZZZZ16

Reserved ROM area

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