MC68HC708AS48

Manufacturer Part NumberMC68HC708AS48
DescriptionAdvance Information
ManufacturerFREESCALE [Freescale Semiconductor, Inc]
MC68HC708AS48 datasheet
 
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Clock Generator Module (CGM)
8.4.4 CGM External Connections
In its typical configuration, the CGM requires seven external
components. Five of these are for the crystal oscillator and two are for
the PLL.
The crystal oscillator is normally connected in a Pierce oscillator
configuration, as shown in
representation of the internal components and may not represent actual
circuitry. The oscillator configuration uses five components:
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 8-3
Routing should be done with great care to minimize signal cross talk and
noise. (See
information and more information on the filter capacitor’s value and its
effects on PLL performance.)
Advance Information
108
Figure
8-3.
Crystal, X
1
Fixed capacitor, C
1
Tuning capacitor, C
, can also be a fixed capacitor
2
Feedback resistor, R
B
Series resistor, R
, optional
S
) is included in the diagram to follow strict Pierce
S
also shows the external components for the PLL:
Bypass capacitor, C
BYP
Filter capacitor, C
F
8.10 Acquisition/Lock Time Specifications
Clock Generator Module (CGM)
Figure 8-3
shows only the logical
for routing
MC68HC708AS48
Rev. 4.0
MOTOROLA