HMCS404AC--------------------------------------------------------------------------
•
INTERNAL
OSCILLATOR
CIRCUIT
Fig.
16
gives internal oscillator circuit. The oscillator type
can be selected from a crystal oscillator or a ceramic filter
oscillator without mask option. In any cases, external clock
operation
is
available.
OSC,
<1
Oscillator
Divider
circuit
1/8
Timing
generator
circuit
Fig.
16
I nternal Oscillator Circuit
System
clock
• Oscillator Circuit
External clock
operation
Ceramic filter
oscillator
Crystal
oscillator
Table
20 Examples
of
Oscillator Circuit
Circuit configuration
Oscillator
Open OSC
2
Cl
cerami1
filter
C2
GND
OSCl
GND
ATcut
parallel resonance crystal
~,~--
OS~~C2
Co
Remarks
Ceramic filter CSA6.00MG (Murata)
Rf :
lMn±2%
C, :
30pF±20%
Cz :
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 :
lMn±2%
C,
:
1O~22pF±20%
Cz
:
10~22pF±20%
Crystal:
ATcut
parallel resonance crystal
Co
:
7pF
max.
Rs :
lOOn
max.
f :
2.0
- 6.2MHz
• 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
•.
322
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