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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7560 Group
56
Fig. 62 State transitions of system clock
N
o
t
e
s 1
:
2
:
3
:
4:
5
:
6
:
S
T
m
W
T
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d
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r
2
.
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a
s
e
a
f
t
H
m
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o
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b
d
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p
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l
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d
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a
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o
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I
c
k
N
b
p
e
i
f
o
r
e
n
d
t
h
3
e
2
s
w
k
i
t
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c
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t
o
i
n
g
t
h
e
f
r
o
X
C
m
N
t
h
p
e
i
n
l
o
.
φ
w
-
i
s
n
p
d
e
i
c
e
a
d
t
m
s
o
t
d
h
e
e
s
t
o
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d
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d
l
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-
o
/
h
c
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g
.
h
-
s
p
e
e
d
m
o
d
e
.
x
g
h
n
a
H
I
e
e
k
CM
4
: Xc switch bit
0: Oscillation stop
1: X
CIN
, X
COUT
CM
5
: Main clock (X
IN
–
X
OUT
) 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
: System clock selection bit
0: X
IN
–
X
OUT
selected
(middle-/high-speed mode)
1: X
CIN
–
X
COUT
selected
(low-speed mode)
CPU mode register
(CPUM : address 003B
16
)
b
7
b4
R
e
s
e
t
CM
6
“
0
”
“
1
”
C
“
1
M
6
”
“
0
”
C
M
5
“
0
”
“
1
”
C
M
5
“
0
”
“
1
”
“
”
C
“
1
M
5
C
“
1
M
6
”
“
0
”
“
0
”
”
C
”
M
5
C
M
6
”
“
“
”
“
C
“
1
”
M
6
“
0
”
C
M
7
“
0
”
“
1
”
C
M
7
“
0
”
“
1
”
C
C
C
C
M
7
M
6
M
5
M
4
=
=
=
=
0
1
0
0
(
(
(
(
8
M
8
3
M
i
d
M
2
H
d
H
k
H
z
l
e
z
-
s
s
o
s
e
p
s
t
l
e
c
o
e
c
e
i
l
p
t
d
a
p
e
)
t
e
d
)
l
i
n
d
g
)
)
z
Middle-speed mode
(f(
φ)
= 1 MHz)
C
“
1
M
6
”
“
0
”
C
M
4
“
0
”
“
1
”
C
M
4
“
0
”
“
1
”
CM
7
= 0 (8 MHz selected)
CM
6
= 0 (High-speed)
CM
5
= 0 (8 MHz oscillating)
CM
4
= 0 (32 kHz stopped)
High-speed mode
(f(
φ)
= 4 MHz)
CM
7
= 0 (8 MHz selected)
CM
6
= 1 (Middle-speed)
CM
5
= 0 (8 MHz oscillating)
CM
4
= 1 (32 kHz oscillating)
Middle-speed mode
(f(
φ)
= 1 MHz)
CM
7
= 0 (8 MHz selected)
CM
6
= 0 (High-speed)
CM
5
= 0 (8 MHz oscillating)
CM
4
= 1 (32 kHz oscillating)
High-speed mode
(f(
φ)
= 4 MHz)
“
1
C
4
C
“
1
M
6
“
0
”
”
“
0
”
”
C
”
M
4
C
M
6
”
“
“
”
“
“
”
CM
7
= 1 (32 kHz selected)
CM
6
= 1 (Middle-speed)
CM
5
= 0 (8 MHz oscillating)
CM
4
= 1 (32 kHz oscillating)
L
(
o
f
w-
(
φ
s
=
p
1
e
e
d
k
H
m
z
o
)
d
e
)
6
CM
7
= 1 (32 kHz selected)
CM
6
= 0 (High-speed)
CM
5
= 0 (8 MHz oscillating)
CM
4
= 1 (32 kHz oscillating)
L
(
o
f
w-
(
φ
s
=
p
1
e
e
d
k
H
m
z
o
)
d
e
)
6
CM
7
= 1 (32 kHz selected)
CM
6
= 1 (Middle-speed)
CM
5
= 1 (8 MHz stopped)
CM
4
= 1 (32 kHz oscillating)
L
(
o
f
w-
(
φ
s
=
p
1
e
e
d
k
H
m
z
o
)
d
e
)
6
CM
7
= 1 (32 kHz selected)
CM
6
= 0 (High-speed)
CM
5
= 1 (8 MHz stopped)
CM
4
= 1 (32 kHz oscillating)
L
(
o
f
w-
(
φ
s
=
p
1
e
e
d
k
H
m
z
o
)
d
e
)
6