45
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3822 Group
MITSUBISHI MICROCOMPUTERS
Fig. 45 State transitions of system clock
o
t
e
s
1
:
w
t
c
t
e
m
o
e
y
t
e
a
o
w
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.
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m
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r
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c
t
y
w
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t
a
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a
o
w
.
2
:
T
h
e
a
l
l
m
o
d
e
s
c
a
n
b
e
s
w
i
t
c
h
e
d
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o
t
h
e
s
t
o
p
m
o
d
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o
r
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w
a
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d
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s
o
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e
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w
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s
t
o
p
m
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o
r
t
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e
w
a
i
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m
o
d
e
i
s
e
n
d
e
d
.
3
:
T
i
m
e
r
a
n
d
L
C
D
o
p
e
r
a
t
e
i
n
t
h
e
w
a
i
t
m
o
d
e
.
4
:
W
h
e
n
t
h
e
s
t
o
p
m
o
d
e
i
s
e
n
d
e
d
,
a
d
e
l
a
y
o
f
a
p
p
r
o
x
i
m
a
t
e
l
y
1
m
s
o
c
c
u
r
s
a
u
t
o
m
a
t
i
c
a
l
l
y
b
y
t
i
m
e
r
1
a
n
d
t
i
m
e
r
2
i
n
m
i
d
d
l
e
-
/
h
i
g
h
-
s
p
e
e
d
m
o
d
e
.
5
:
W
h
e
n
t
h
e
s
t
o
p
m
o
d
e
i
s
e
n
d
e
d
,
a
d
e
l
a
y
o
f
a
p
p
r
o
x
i
m
a
t
e
l
y
0
.
2
5
s
o
c
c
u
r
s
a
u
t
o
m
a
t
i
c
a
l
l
y
b
y
t
i
m
e
r
1
a
n
d
t
i
m
e
r
2
i
n
l
o
w
-
s
p
e
e
d
m
o
d
e
.
6
:
W
a
i
t
u
n
t
i
l
o
s
c
i
l
l
a
t
i
o
n
s
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a
b
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a
f
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r
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s
c
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l
l
a
t
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g
t
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m
a
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n
c
l
o
c
k
X
I
N
b
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f
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s
w
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c
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i
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g
f
r
o
m
t
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l
o
w
-
s
p
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e
d
m
o
d
e
t
o
m
i
d
d
l
e
-
/
h
i
g
h
-
s
p
e
e
d
m
o
d
e
.
7
:
T
h
e
e
x
a
m
p
l
e
a
s
s
u
m
e
s
t
h
a
t
8
M
H
z
i
s
b
e
i
n
g
a
p
p
l
i
e
d
t
o
t
h
e
X
I
N
p
i
n
a
n
d
3
2
k
H
z
t
o
t
h
e
XC
I
N
p
i
n
.
φ
i
n
d
i
c
a
t
e
s
t
h
e
i
n
t
e
r
n
a
l
c
l
o
c
k
.
4 :
ort
c sw
tc
t
0: I/O port
1: X
CIN, XCOUT
CM5 : Main clock (XIN–XOUT) stop bit
0: Oscillating
1: Stopped
CM
6 : Main clock division ratio selection bit
0: f(X
IN)/2 (high-speed mode)
1: f(X
IN)/8 (middle-speed mode)
CM
7 : Internal system clock selection bit
0: X
IN–XOUT selected
(middle-/high-speed mode)
1: X
CIN–XCOUT selected
(low-speed mode)
mo
e reg
ster
(CPUM : address 003B
16)
7
4
ese
6
“
0
”“1”
C
M4
“
0
”“
1
”
C
M7
=
0
(
8
M
H
z
s
e
l
e
c
t
e
d
)
C
M6
=
1
(
M
i
d
d
l
e
-
s
p
e
e
d
)
C
M5
=
0
(
8
M
H
z
o
s
c
i
l
l
a
t
i
n
g
)
C
M4
=
0
(
3
2
k
H
z
s
t
o
p
p
e
d
)
M
i
d
d
l
e
-
s
p
e
e
d
m
o
d
e
(
f
(φ)
=
1
M
H
z
)
C
M7
=
0
(
8
M
H
z
s
e
l
e
c
t
e
d
)
C
M6
=
1
(
M
i
d
d
l
e
-
s
p
e
e
d
)
C
M5
=
0
(
8
M
H
z
o
s
c
i
l
l
a
t
i
n
g
)
C
M4
=
1
(
3
2
k
H
z
o
s
c
i
l
l
a
t
i
n
g
)
M
i
d
d
l
e
-
s
p
e
e
d
m
o
d
e
(
f
(φ)
=
1
M
H
z
)
C
M7
=
0
(
8
M
H
z
s
e
l
e
c
t
e
d
)
C
M6
=
0
(
H
i
g
h
-
s
p
e
e
d
)
C
M5
=
0
(
8
M
H
z
o
s
c
i
l
l
a
t
i
n
g
)
C
M4
=
0
(
3
2
k
H
z
s
t
o
p
p
e
d
)
High-speed mode (f(φ) = 4 MHz)
CM7 = 0 (8 MHz selected)
CM6 = 0 (High-speed)
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
High-speed mode (f(φ) = 4 MHz)
C
M7
=
1
(
3
2
k
H
z
s
e
l
e
c
t
e
d
)
C
M6
=
1
(
M
i
d
d
l
e
-
s
p
e
e
d
)
C
M5
=
0
(
8
M
H
z
o
s
c
i
l
l
a
t
i
n
g
)
C
M4
=
1
(
3
2
k
H
z
o
s
c
i
l
l
a
t
i
n
g
)
L
o
w
-
s
p
e
e
d
m
o
d
e
(
f
(φ)
=
1
6
k
H
z
)
CM7 = 1 (32 kHz selected)
CM6 = 0 (High-speed)
CM5 = 0 (8 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
L
o
w
-
s
p
e
e
d
m
o
d
e
(
f
(φ)
=
1
6
k
H
z
)
C
M7
=
1
(
3
2
k
H
z
s
e
l
e
c
t
e
d
)
C
M6
=
1
(
M
i
d
d
l
e
-
s
p
e
e
d
)
C
M5
=
1
(
8
M
H
z
s
t
o
p
p
e
d
)
C
M4
=
1
(
3
2
k
H
z
o
s
c
i
l
l
a
t
i
n
g
)
L
o
w
-
s
p
e
e
d
m
o
d
e
(
f
(φ)
=
1
6
k
H
z
)
C
M7=
1
(
3
2
k
H
z
s
e
l
e
c
t
e
d
)
C
M6=
0
(
H
i
g
h
-
s
p
e
e
d
)
C
M5=
1
(
8
M
H
z
s
t
o
p
p
e
d
)
C
M4=
1
(
3
2
k
H
z
o
s
c
i
l
l
a
t
i
n
g
)
L
o
w
-
s
p
e
e
d
m
o
d
e
(
f
(φ)
=
1
6
k
H
z
)
6
“
0
”“1”
6
“
0
”“1”
6
“
0
”“1”
C
M4
“
0
”“
1
”
C
M
7
“
0
”“
1
”
C
M
7
“
0
”“
1
”
C
M5
“
0
”“
1
”
C
M
5
“
0
”“
1
”
C
M
4
C
M
6
“
0
”
“
1
”
“
0
”
“
1
”
C
M
4
C
M
6
“
0
”
“
1
”
“
1
”
“
0
”
C
M
5
C
M
6
“
0
”
“
1
”
“
0
”
“
1
”
C
M
5
C
M
6
“
0
”
“
1
”
“
1
”
“
0
”
(16 Seiten)
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