51.6.2 Crystal Oscillator

Figure 51-8. Crystal Oscillator Schematic

The crystal should be located as close to the device as possible. Long signal lines may cause too high load to operate the crystal, and cause crosstalk to other parts of the system.

Table 51-5. Crystal Oscillator Checklist
Signal NameRecommended Pin ConnectionDescription
XINLoad capacitor CLEXT(1)(2)External crystal between 0.4 to 32MHz
XOUTLoad capacitor CLEXT(1)(2)
Note:
  1. Use the equation in Crystal Oscillator Characteristics to calculate CLEXT.
  2. The capacitors should be placed close to the device for each supply pin pair in the signal group.