38B5 datasheet(9/70 Pages) RENESAS

9 / 70 page

MITSUBISHI MICROCOMPUTERS

38B5 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PRELIMINAR

Notice:

This

is not

a final

specification.

Some

parametric

limits

are

subject

to change.

Memory

Special function register (SFR) area

The special function register (SFR) area in the zero page contains

control 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 other areas are user areas for storing pro-

grams.

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 registers (SFR)

are allocated to this area.

The zero page addressing mode can be used to specify memory and

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

Special page

The 256 bytes from addresses FF0016 to FFFF16 are called the spe-

cial page area. The special page addressing mode can be used to

specify memory addresses in the special page area. Access to this

area with only 2 bytes is possible in the special page addressing

mode.

Fig. 6 Memory Map Diagram

010016

000016

004016

044016

FF0016

FFDC16

FFFE16

FFFF16

192

256

384

512

640

768

896

1024

1536

2048

XXXX16

00FF16

013F16

01BF16

023F16

02BF16

033F16

03BF16

043F16

063F16

083F16

4096

8192

12288

16384

20480

24576

28672

32768

36864

40960

45056

49152

53248

57344

61440

F00016

E00016

D00016

C00016

B00016

A00016

900016

800016

700016

600016

500016

400016

300016

200016

100016

F08016

E08016

D08016

C08016

B08016

A08016

908016

808016

708016

608016

508016

408016

308016

208016

108016

YYYY16

ZZZZ16

RAM

ROM

0EF016

0F0016

0EFF16

0FFF16

Reserved area

SFR area 1

Not used (Note)

Interrupt vector area

ROM area

Reserved ROM area

(common ROM area,128 byte)

Zero page

Special page

RAM area

RAM size

(byte)

Address

XXXX16

ROM size

(byte)

Address

YYYY16

Reserved ROM area

Address

ZZZZ16

SFR area 2

RAM area for Serial I/O automatic

transfer

RAM area for FLD automatic display

Note: When 1024 bytes or more are used as RAM area, this area can be used.

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