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Hitachi MB-6890 Service Manual page 51

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6-4
Timing
6-4-1
System
clock
In
the
system
in
below
6-4-2
Clock
Fig.
6-7
32.256
MHZ
by crystal
(LI,
C2Ol).
32.256
MHZ
circuit
(IC37)
4.032
MHZ
used
for
and
RS-232C
characters).
(40
M U
(ICI)
(
All manuals and user guides at all-guides.com
signal
generator.
specification
clock
various
circuit,
generator
ification.
clock
spec
is
circuit
and
general
circuit
generator
shows
the
clock
generator
Oscillator
is
done
oscillator
(XI),
2
The
LC
resonance
oscillation
easier.
16.128
(IC37,
to
MHZ
12
Pin)
and
2.016
(IC37,
signal
system
generator,
clock.
8.064
mHZ'is
'
4.032
is
MHZ
for
the
and
display
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,ns
HIT
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ms
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19.
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Clock
generator
clock
generating
are
Each
clock
specification
describes
in
Fig.
6-6.
clock
circuit.
In
the
3rd
by
oven
tone
(IC43)
and
Inverters
is
circuit
(LI,
C2Ol)
is
32.256
clock
MHZ
14
Pin)
8.046
MHZ'(IC37,
ll
pin).
signal
display
DOTCK
the
used
for
display
'
used
for
EXTAL
signal,
clock.
<
b
uffer),4so4P
8
ICG
I
f . i ? _ _ .
'4Lb367AP
'Z
H'
rs
~
rm
§/WH1.
M
z
4*/4:2
2i"""'
'5
1
¢irCuit
according
to
is
written
circuit
generator
oscillator
circuit
'
"
LC
resonance
circuit
make
the
used
to
divided
by
divider
MHZ(IC37,
13
Pin),
16.128
M H Z i s
characters)
(80
DOTCK
signal
'
d
from
tt
inpu
e

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