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SIMOSCEN
OSC1
*R
can be zero (shorted) when used with higher-frequency crystals. Refer to manufacturer's data.
S
MC68HC908AB32
Rev. 1.0
—
MOTOROLA
•
Crystal, X
•
Fixed capacitor, C
•
Tuning capacitor, C
•
Feedback resistor, R
•
Series resistor, R
The series resistor (R
oscillator guidelines and may not be required for all ranges of operation,
especially with high frequency crystals. Refer to the crystal
manufacturer's data for more information.
Figure 9-3
also shows the external components for the PLL:
•
Bypass capacitor, C
•
Filter capacitor, C
Care should be taken with routing in order to minimize signal cross talk
and noise. (See
information and more information on the filter capacitor's value and its
effects on PLL performance).
OSC2
R
B
*
R
S
X
1
C
C
1
2
Figure 9-3. CGM External Connections
Clock Generator Module (CGM)
1
1
(can also be a fixed capacitor)
2
B
(optional)
S
) is included in the diagram to follow strict Pierce
S
BYP
F
9.10 Acquisition/Lock Time Specifications
CGMXCLK
V
SSA
Clock Generator Module (CGM)
Functional Description
CGMXFC
V
DDA
V
C
F
C
BYP
Technical Data
for routing
DD
141
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