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M38220E1-FP Datasheet

  • M38220E1-FP

  • SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

  • 980.52KB

  • 78页

  • MITSUBISHI   MITSUBISHI

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MITSUBISHI MICROCOMPUTERS
3822 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.
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-
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.
RAM
RAM is used for data storage and for stack area of subroutine
calls and interrupts.
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.
Access to this area with only 2 bytes is possible in the special
page addressing mode.
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.
RAM area
RAM size
(bytes)
192
256
384
512
640
768
896
1024
Address
XXXX
16
00FF
16
013F
16
01BF
16
023F
16
02BF
16
033F
16
03BF
16
043F
16
0840
16
ROM area
ROM size
(bytes)
4096
8192
12288
16384
20480
24576
28672
32768
36864
40960
45056
49152
Address
YYYY
16
F000
16
E000
16
D000
16
C000
16
B000
16
A000
16
9000
16
8000
16
7000
16
6000
16
5000
16
4000
16
Address
ZZZZ
16
F080
16
E080
16
D080
16
C080
16
B080
16
A080
16
9080
16
8080
16
7080
16
6080
16
5080
16
4080
16
FFFE
16
Reserved ROM area
FFFF
16
FFDC
16
Interrupt vector area
Special page
ROM
FF00
16
ZZZZ
16
YYYY
16
Reserved ROM area
(128 bytes)
Not used
Reserved area
XXXX
16
RAM
0000
16
SFR area
0040
16
0050
16
0100
16
LCD display RAM area
Zero page
Fig. 12 Memory map diagram
15

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