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Renesas PCA4738L-64A Información técnica Pagina 18

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
3825 Group
15
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. 11 Memory map diagram
192
256
384
512
640
768
896
1024
1536
2048
00
FF
16
013F
16
01BF
16
023F
16
02BF
16
033F
16
03BF
16
043F
16
063F
16
083F
16
RAM
area
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
409
6
819
2
1228
8
1638
4
2048
0
2457
6
2867
2
3276
8
3686
4
4096
0
4505
6
4915
2
5324
8
5734
4
6144
0
F
000
16
E000
16
D000
16
C000
16
B000
16
A000
16
9000
16
8000
16
7000
16
6000
16
5000
16
4000
16
3000
16
2000
16
1000
16
F
080
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
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
0840
16
FF
00
16
FFDC
16
F
F
F
E
1
6
FFFF
16
XXXX
16
YYYY
16
ZZZZ
16
RAM
R
O
M
0054
16
R
eserve
d
area
S
F
R
a
r
e
a
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
e
r
o
p
a
g
e
S
pec
i
a
l
page
LCD
di
sp
l
ay
RAM
area
R
e
s
e
r
v
e
d
R
O
M
a
r
e
a
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