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Renesas PROM Programming Adapters PCA7438F-64A Spécifications Page 11

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Rev.2.40 Jun 14, 2004 page 11 of 56
38C1 Group
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-
ters (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. Ac-
cess to this area with only 2 bytes is possible in the special page
addressing mode.
Fig. 9 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
1
5
3
6
2
0
4
8
00
FF
16
013F
16
01BF
16
023F
16
02BF
16
033F
16
03BF
16
043F
16
063F
16
083F
16
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
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
F
0
8
0
1
6
E
0
8
0
1
6
D
0
8
0
1
6
C
0
8
0
1
6
B
0
8
0
1
6
A
0
8
0
1
6
9
0
8
0
1
6
8
0
8
0
1
6
7
0
8
0
1
6
6
0
8
0
1
6
5
0
8
0
1
6
4
0
8
0
1
6
3
0
8
0
1
6
2
0
8
0
1
6
1
0
8
0
1
6
ROM
area
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
0100
16
0000
16
0040
16
0440
16
FF
00
16
FFDC
16
F
F
F
E
1
6
FFFF
16
XXXX
16
YYYY
16
ZZZZ
16
RAM
R
O
M
R
eserve
d
area
S
F
R
a
r
e
a
N
ot use
d
(N
ote
)
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
e
r
o
p
a
g
e
S
p
e
c
i
a
l
p
a
g
e
R
e
s
e
r
v
e
d
R
O
M
a
r
e
a
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