M38072MD-XXXFP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M38072MD-XXXFP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

3807 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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 reset 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 registers (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 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.

RAM area

RAM capacity

(byte)

192

256

384

512

640

768

896

1024

1536

2048

Address

XXXX16

00FF16

013F16

01BF16

023F16

02BF16

033F16

03BF16

043F16

063F16

083F16

ROM area

ROM capacity

(byte)

4096

8192

12288

16384

20480

24576

28672

32768

36864

40960

45056

49152

53248

57344

61440

Address

YYYY16

F00016

E00016

D00016

C00016

B00016

A00016

900016

800016

700016

600016

500016

400016

300016

200016

100016

Fig. 6. Memory map diagram

Address

ZZZZ16

F08016

E08016

D08016

C08016

B08016

A08016

908016

808016

708016

608016

508016

408016

308016

208016

108016

000016

RAM

004016

010016

SFR area

Zero page

XXXX16

Reserved area

084016

Not used

ROM YYYY16 Reserved ROM area

(128 byte)

ZZZZ16

FF0016

FFDC16

FFFE16

FFFF16

Interrupt vector area

Reserved ROM area

Special page

8

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