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4.4.2 When Crystal/Ceramic Oscillation is Used
(1) As the oscillator is a high-frequency analog circuit, considerable care is required.
The following points, in particular, require attention.
• The wiring should be kept as short as possible.
• No other signal lines should be crossed.
• Avoid lines carrying a high fluctuating current.
• The oscillator capacitor grounding point should always be at the same potential as the V
to a ground pattern carrying a high current.
• A signal should not be taken from the oscillator.
If oscillation is not performed normally and stably, the microcontroller will not be able to operate normally and
stably, either. Also, if a high-precision oscillation frequency is required, consultation with the oscillator manufacturer
is recommended.
Cautions 1. The oscillator should be as close as possible to the X1 and X2 pins.
2. No other signal lines should pass through the area enclosed by the dotted line.
110
CHAPTER 4 CLOCK GENERATOR
Figure 4-6 Cautions on Resonator Connection
µ PD784038
X2
X1
User's Manual U11316EJ4V1UD
V
SS1
pin. Do not ground
SS1
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