Renesas PCA4738L-64A Technical Information Seite 18

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Seitenansicht 17
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
1
9
2
2
5
6
3
8
4
5
1
2
6
4
0
7
6
8
8
9
6
1
0
2
4
0
0
1
6
0
1
3
F1
6
0
1
B
F1
6
0
2
3
F1
6
0
2
B
F1
6
0
3
3
F1
6
0
3
B
F1
6
0
4
3
F1
6
R
A
M
a
r
e
a
R
A
M
s
i
z
e
(
b
y
t
e
s
)
A
d
d
r
e
s
s
X
X
X
X
1
6
4
0
9
6
8
1
9
2
1
2
2
8
8
1
6
3
8
4
2
0
4
8
0
2
4
5
7
6
2
8
6
7
2
3
2
7
6
8
3
6
8
6
4
4
0
9
6
0
4
5
0
5
6
4
9
1
5
2
F
00016
E00016
D00016
C00016
B00016
A00016
900016
800016
700016
600016
500016
400016
F
08016
E08016
D08016
C08016
B08016
A08016
908016
808016
708016
608016
508016
408016
R
O
M
a
r
e
a
ROM
s
i
ze
(bytes)
A
d
d
r
e
s
s
Y
Y
Y
Y
1
6
A
d
d
r
e
s
s
Z
Z
Z
Z
1
6
010016
0
0
0
01
6
0
0
4
01
6
0
8
4
01
6
F
F
0
0
1
6
FFDC
16
FFFE
16
F
F
F
F
1
6
X
X
X
X
1
6
Y
Y
Y
Y
1
6
ZZZZ
16
RAM
ROM
R
eserve
d
area
SFR
area
N
ot use
d
I
n
t
e
r
r
u
p
t
v
e
c
t
o
r
a
r
e
a
R
eserve
d
ROM
area
(128 bytes)
Z
ero page
S
pec
i
a
l
page
R
eserve
d
ROM
area
0
0
5
01
6
L
C
D
d
i
s
p
l
a
y
R
A
M
a
r
e
a
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