參數(shù)資料
型號(hào)： M38221MAXXXFS
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(jī)
文件頁(yè)數(shù)： 7/78頁(yè)
文件大?。?/td> 998K
代理商： M38221MAXXXFS
15
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3822 Group
MITSUBISHI MICROCOMPUTERS
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-
ter (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.
Access to this area with only 2 bytes is possible in the special
page addressing mode.
Fig. 12 Memory map diagram
192
256
384
512
640
768
896
1024
00FF16
013F16
01BF16
023F16
02BF16
033F16
03BF16
043F16
RAM area
RAM size
(bytes)
Address
XXXX16
4096
8192
12288
16384
20480
24576
28672
32768
36864
40960
45056
49152
F00016
E00016
D00016
C00016
B00016
A00016
900016
800016
700016
600016
500016
400016
F08016
E08016
D08016
C08016
B08016
A08016
908016
808016
708016
608016
508016
408016
ROM area
ROM size
(bytes)
Address
YYYY16
Address
ZZZZ16
010016
000016
004016
084016
FF0016
FFDC16
FFFE16
FFFF16
XXXX16
YYYY16
ZZZZ16
RAM
ROM
Reserved area
SFR area
Not used
Interrupt vector area
Reserved ROM area
(128 bytes)
Zero page
Special page
Reserved ROM area
005016
LCD display RAM area
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