User`s manual
152
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37281MAH–XXXSP,M37281MFH–XXXSP
M37281MKH–XXXSP,M37281EKSP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
Address 00FA16
b7 b6 b5 b4 b3 b2 b1 b0
I
2
C clock control register (S2) [Address 00FA16]
I
2
C Clock Control Register
0
to
4
SCL frequency control bits
(CCR0 to CCR4)
7
5
6
SCL mode
specification bit
(FAST MODE)
0: Standard clock mode
1: High-speed clock mode
0Standard
clock mode
B
Name
Function
s
After reset R
W
0
0
0
ACK bit
(ACK BIT)
ACK clock bit
(ACK)
0: ACK is returned.
1: ACK is not returned.
0: No ACK clock
1: ACK clock
High speed
clock mode
Setup disabled
Setup disabled
00 to 02
33303
25004
100
400 (See note)
05
83.3 16606
500/CCR value 1000/CCR value
...
17.2 34.5
1D
16.6 33.3
1E
16.1
32.3
1F
Note: At 400 kHz in the high-speed clock mode, the duty is as below .
“0” period : “1” period = 3 : 2
In the other cases, the duty is as below.
“0” period : “1” period = 1 : 1
Register
value
b4 to b0
R
W
R
W
R
W
R
W
(at f = 4 MHz, unit : kHz)
Setup disabled
Setup disabled
Address 00FB16
C
P
U
M
o
d
e
R
e
g
i
s
t
e
r
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
tR
W
0
,
1
2
3
,
4
0
1
N
a
m
e
F
u
n
c
t
i
o
n
s
P
r
o
c
e
s
s
o
r
m
o
d
e
b
i
t
s
(
C
M
0
,
C
M
1
)
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
.
”
1
S
t
a
c
k
p
a
g
e
s
e
l
e
c
t
i
o
n
b
i
t
(
C
M
2
)
(
S
e
e
n
o
t
e
)
1
b
1
b
0
0
:
0
p
a
g
e
1
:
1
p
a
g
e
1
0
0
5
1
6
0
M
a
i
n
C
l
o
c
k
(
XI
N–
XO
U
T)
s
t
o
p
b
i
t
(
C
M
6
)
C
P
U
m
o
d
e
r
e
g
i
s
t
e
r
(
C
M
)
[
A
d
d
r
e
s
s
0
0
F
B1
6]
R
W
R
W
R
W
R
W
R
W
0
:
L
O
W
d
r
i
v
e
1
:
H
I
G
H
d
r
i
v
e
0
:
O
s
c
i
l
l
a
t
i
n
g
1
:
S
t
o
p
p
e
d
7
0
I
n
t
e
r
n
a
l
s
y
s
t
e
m
c
l
o
c
k
s
e
l
e
c
t
i
o
n
b
i
t
(
C
M
7
)
R
W
0
:
XI
N–
XO
U
T
s
e
l
e
c
t
e
d
(
h
i
g
h
-
s
p
e
e
d
m
o
d
e
)
1
:
X
C
I
N–
XC
O
U
T
s
e
l
e
c
t
e
d
(
l
o
w
-
s
p
e
e
d
m
o
d
e
)
N
o
t
e
:
T
h
i
s
b
i
t
i
s
s
e
t
t
o
“
1
”
a
f
t
e
r
t
h
e
r
e
s
e
t
r
e
l
e
a
s
e
.
XC
O
U
T
d
r
i
v
a
b
i
l
i
t
y
s
e
l
e
c
t
i
o
n
b
i
t
(
C
M
5
)