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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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