HMCS404CL--------------------------------------------------------------------------
• INTERNAL OSCILLATOR CIRCUIT
can be selected from a crystal oscillator or a ceramic filter
oscillator. In any cases, external clock operation
is
available.
Fig.
16
gives
internal oscillator circuit. The oscillator type
• Oscillator
Circuit
External
clock
operation
Ceramic filter
oscillator
Crystal
oscillator
OSC.
l>
Oscillator
OSC.
<J
Divider
circuit
1/8
Timing
generator
circuit
SyStem
clock
Fig. 16 Internal Oscillator
Circuit
Table
20
Examples
of
Oscillator
Circuit
Circu it
configuration
Oscillator
D-
OSC,
Open-
OSC.
£
f;~~~;'
,OSC'
It---4-
~
OSC2
C2
~
______
_
GND
CI
t
rysta;L
OSCI
Sf!
:ff
~J\""
•
. r
VlY
OSC2
C2
~
______
_
GND
GT
cut parallel resonance crystal
~,~
OS~~C2
Co
Remarks
Ceramic
filter
CSA2.000MK
(Murata)
Rf
:
lMn
±2%
C.
: 30pF
±20%
C. : 30pF ±
20%
•
Wiring
between these pins and elements should
be
as
short
as
possible,
and never cross the other wirings. (Refer to
Fig.
17)
Rf
: 2Mn±2%
C. : 10-22pF±20%
C.
: 10-22pF±20%
Crystal:
GT
cut parallel resonance crystal
Co
: 7pF
max.
Rs
:
lOon
max.
f : 2.0 -
2.25MHz
• Wiring
between
these
pins
should
be
as
short
as possible,
and
never cross
the
other
wirings. (Refer
to
Fig. 17)
Note)
Please
consult
with
the engineers of crystal or ceramic filter maker to determine the
value
of
Rf,
C,
and
C
•.
360
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