4.
External clock input method
Connect an external clock signal to pin OSC
1
, and leave pin OSC
2
open. Figure 4-6 shows a typical
connection.
Figure 4-6 External Clock Input (Example)
Frequency
Oscillator Clock (ø
OSC
)
Duty cycle
45% to 55%
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.
1
2
OSC
OSC
External clock input
Open
90