
44
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3822 Group
MITSUBISHI MICROCOMPUTERS
Fig.44 Clock generating circuit block diagram
i
n
s
t
r
u
c
t
i
o
n
nstruct
on
m
ng φ
(Internal system clock)
nstruct
on
a
n c
oc
stop
t
m
e
r
2
m
e
r
1
1/2
1/4
I
N
O
U
T
C
O
U
T
C
I
N
n
t
e
r
r
u
p
t
r
e
q
u
e
s
eset
o
r
t
C
s
w
t
c
t
“
1
”“0”
m
e
r
1
c
o
u
n
t
s
o
u
r
c
e
s
e
l
e
c
t
i
o
n
b
i
t
m
e
r
2
c
o
u
n
t
s
o
u
r
c
e
s
e
l
e
c
t
i
o
n
b
i
t
o
w
-
s
p
e
e
m
o
e
e-/
g
-spee
mo
e
n
t
e
r
n
a
s
y
s
t
e
m
c
o
c
s
e
e
c
t
o
n
t
(
N
o
t
e
)
e
-
s
p
e
e
m
o
e
g
-spee
mo
e
or Low-speed mode
ote :
en us
ng t
e
ow-spee
mo
e, set t
e port
C sw
tc
t to “1” .
a
n c
oc
v
s
on rat
o se
ect
on
t
“
1
”
“0”
“
1
”
“
0
”
“
1
”
“
0
”
n
t
e
r
r
u
p
t
s
a
e
a
g
1
/
2
“
1
”
“0”
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