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參數(shù)資料
| 型號： | M38021M6 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機 |
| 文件頁數(shù)： | 9/51頁 |
| 文件大?。?/td> | 692K |
| 代理商： | M38021M6 |
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MITSUBISHI MICROCOMPUTERS
3802 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
9
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 0000
16
to 00FF
16
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 FF00
16
to FFFF
16
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. 2 Memory map diagram
0100
16
0000
16
0040
16
0440
16
FF00
16
FFDC
16
FFFE
16
FFFF
16
192
256
384
512
640
768
896
1024
XXXX
16
00FF
16
013F
16
01BF
16
023F
16
02BF
16
033F
16
03BF
16
043F
16
4096
8192
12288
16384
20480
24576
28672
32768
F000
16
E000
16
D000
16
C000
16
B000
16
A000
16
9000
16
8000
16
F080
16
E080
16
D080
16
C080
16
B080
16
A080
16
9080
16
8080
16
YYYY
16
ZZZZ
16
RAM
ROM
Reserved area
SFR area
Not used
Interrupt vector area
ROM area
Reserved ROM area
(128 bytes)
Zero page
Special page
RAM area
RAM capacity
(bytes)
Address
XXXX
16
ROM capacity
(bytes)
Address
YYYY
16
Reserved ROM area
Address
ZZZZ
16
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