XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 180

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

Clock Generator Module (CGM)
10.4.4 CGM External Connections
Technical Data
180
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
logical representation of the internal components and may not represent
actual circuitry. The oscillator configuration uses five components:
The series resistor (R
especially with high-frequency crystals. Refer to the crystal
manufacturer’s data for more information.
Figure 10-3
Routing should be done with great care to minimize signal cross talk and
noise. (See
routing information and more information on the filter capacitor’s value
and its effects on PLL performance).
•
•
•
•
•
•
•
Crystal, X
Fixed capacitor, C
Tuning capacitor, C
Feedback resistor, R
Series resistor, R
Bypass capacitor, C
Filter capacitor, C
Clock Generator Module (CGM)
Acquisition/Lock Time Specifications
also shows the external components for the PLL:
1
S
) may not be required for all ranges of operation,
S
F
1
(optional)
2
BYP
Figure
B
(can also be a fixed capacitor)
10-3.
Figure 10-3
MC68HC908AZ60A — Rev 2.0
shows only the
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