MITSUBISHI MICROCOMPUTERS
3822 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MEMORY
Zero Page
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.
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.
RAM
RAM is used for data storage and for stack area of subroutine
calls and interrupts.
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.
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
000016
RAM size
(bytes)
Address
XXXX16
SFR area
Zero page
004016
005016
192
256
384
512
640
768
896
1024
00FF16
013F16
01BF16
023F16
02BF16
033F16
03BF16
043F16
LCD display RAM area
010016
RAM
XXXX16
084016
Reserved area
Not used
ROM area
Address
YYYY16
Address
ZZZZ16
ROM size
(bytes)
YYYY16
ZZZZ16
Reserved ROM area
(128 bytes)
F00016
E00016
D00016
C00016
B00016
A00016
900016
800016
700016
600016
500016
400016
F08016
E08016
D08016
C08016
B08016
A08016
908016
808016
708016
608016
508016
408016
4096
8192
12288
16384
20480
24576
28672
32768
36864
40960
45056
49152
ROM
FF0016
FFDC16
Special page
Interrupt vector area
Reserved ROM area
FFFE16
FFFF16
Fig. 12 Memory map diagram
15
MITSUBISHI [ Mitsubishi Group ]
