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To be avoided
Note: The circuit parameters above are recommended by the crystal or ceramic oscillator
manufacturer.
The circuit parameters are affected by the crystal or ceramic oscillator and floating
capacitance when designing the board. When using the oscillator, consult with the crystal
or ceramic oscillator manufacturer to determine the circuit parameters.
External Clock Input Method
Connect an external clock signal to pin OSC
typical connection.
Frequency
Duty cycle
C
1
C
2
Figure 4.6 Board Design of Oscillator Circuit
OSC
1
OSC
Open
2
Figure 4.7 External Clock Input (Example)
Oscillator Clock (φ φ φ φ
45% to 55%
Signal A Signal B
, and leave pin OSC
1
External clock input
)
OSC
OSC
1
OSC
2
open. Figure 4.7 shows a
2
Rev. 6.00, 08/04, page 107 of 628
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