User`s manual
139
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
M37281MAH–XXXSP,M37281MFH–XXXSP
M37281MKH–XXXSP,M37281EKSP
Structure of Register
The figure of each register structure describes its functions, contents
at reset, and attributes as follows:
(
N
o
t
e
1
)
(
N
o
t
e
2
)
2: Bit attributes••••••The attributes of control register bits are classified into 3 types : read-only, write-only
and read and write. In the figure, these attributes are represented as follows :
: Bit in which nothing is assigned
N
o
t
e
s
1
:
V
a
l
u
e
s
i
m
m
e
d
i
a
t
e
l
y
a
f
t
e
r
r
e
s
e
t
r
e
l
e
a
s
e
0
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
“
0
”
a
f
t
e
r
r
e
s
e
t
r
e
l
e
a
s
e
1
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
“
1
”
a
f
t
e
r
r
e
s
e
t
r
e
l
e
a
s
e
I
n
d
e
t
e
r
m
i
n
a
t
e
•
•
•
I
n
d
e
t
e
r
m
i
n
a
t
e
a
f
t
e
r
r
e
s
e
t
r
e
l
e
a
s
e
•
•
•
•
•
•
R
e
a
d
e
n
a
b
l
e
d
•
•
•
•
•
•
R
e
a
d
d
i
s
a
b
l
e
d
R
–
R•
•
•
•
•
•
R
e
a
d
•
•
•
•
•
•
W
r
i
t
e
e
n
a
b
l
e
d
•
•
•
•
•
•
W
r
i
t
e
d
i
s
a
b
l
e
d
•
•
•
•
•
•
“
0
”
c
a
n
b
e
s
e
t
b
y
s
o
f
t
w
a
r
e
,
b
u
t
“
1
”
c
a
n
n
o
t
b
e
s
e
t
.
W•
•
•
•
•
•
W
r
i
t
e
W
–
✽
b
7
b
6
b
5
b
4
b
3
b
2
b
1b
0
B
A
f
t
e
r
r
e
s
e
t
R
W
C
P
U
M
o
d
e
R
e
g
i
s
t
e
r
0
,
1
2
3
,
4
0
1
N
a
m
e
Function
s
Processor mode bits
(CM0, CM1)
0
0
:
S
i
n
g
l
e
-
c
h
i
p
m
o
d
e
0
1
:
1
0
:
N
o
t
a
v
a
i
l
a
b
l
e
1
1
:
F
i
x
t
h
e
s
e
b
i
t
s
t
o
“
1
.
”
0
Stack page selection
bit (See note) (CM2)
1
b
1
b
0
0: 0 page
1: 1 page
1
0
0
5
1N
o
t
h
i
n
g
i
s
a
s
s
i
g
n
e
d
.
T
h
i
s
b
i
t
i
s
w
r
i
t
e
d
i
s
a
b
l
e
b
i
t
.
W
h
e
n
t
h
i
s
b
i
t
i
s
r
e
a
d
o
u
t
,
t
h
e
v
a
l
u
e
i
s
“
0
.
”
6,
7
0
Clock switch bits
(CM6, CM7)
0 0: f(X
IN) = 8 MHz
0 1: f(X
IN) = 12 MHz
1 0: f(X
IN) = 16 MHz
1 1: Do not set
b
7
b
6
CPU mode register (CPUM) (CM) [Address 00FB16]
R
W
R
W
R
W
R
W
R
W
<
E
x
a
m
p
l
e
>
B
i
t
s
p
o
s
i
t
i
o
nB
i
t
a
t
t
r
i
b
u
t
e
s
V
a
l
u
e
s
i
m
m
e
d
i
a
t
e
l
y
a
f
t
e
r
r
e
s
e
t
r
e
l
e
a
s
e