Renesas PCA4738S-42A Spezifikationen Seite 7

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Seitenansicht 6
6
3851 Group
(Built-in 16 KB ROM)
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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
Access to this area with only 2 bytes is possible in the zero page
addressing mode.
Special Page
Access to this area with only 2 bytes is possible in the special
page addressing mode.
Fig. 5 Memory map diagram
0100
16
0000
16
0040
16
FF00
16
F
F
D
C
1
6
F
F
F
E
1
6
F
F
F
F
1
6
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
1
5
3
6
2
0
4
8
3
0
7
2
4
0
3
2
XXXX
16
0
0
F
F
1
6
0
1
3
F
1
6
0
1
B
F
1
6
0
2
3
F
1
6
0
2
B
F
1
6
0
3
3
F
1
6
0
3
B
F
1
6
0
4
3
F
1
6
0
6
3
F
1
6
0
8
3
F
1
6
0
C
3
F
1
6
0
F
F
F
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
5
3
2
4
8
5
7
3
4
4
6
1
4
4
0
F
0
0
0
1
6
E
0
0
0
1
6
D
0
0
0
1
6
C
0
0
0
1
6
B
0
0
0
1
6
A
0
0
0
1
6
9
0
0
0
1
6
8
0
0
0
1
6
7
0
0
0
1
6
6
0
0
0
1
6
5
0
0
0
1
6
4
0
0
0
1
6
3
0
0
0
1
6
2
0
0
0
1
6
1
0
0
0
1
6
F080
16
E080
16
D080
16
C080
16
B080
16
A080
16
9080
16
8080
16
7080
16
6080
16
5080
16
4080
16
3080
16
2080
16
1080
16
Y
Y
Y
Y
1
6
Z
Z
Z
Z
1
6
R
A
M
R
O
M
0440
16
S
F
R
a
r
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a
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a
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a
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s
e
r
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e
d
R
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M
a
r
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a
(
1
2
8
b
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s
)
Z
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p
a
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p
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c
i
a
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a
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R
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a
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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
R
O
M
s
i
z
e
(
b
y
t
e
s
)
A
d
d
r
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s
Y
Y
Y
Y
1
6
R
e
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R
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M
a
r
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a
A
d
d
r
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s
s
Z
Z
Z
Z
1
6
Reserved area
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