UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 121

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

4.4.2 When Crystal/Ceramic Oscillation is Used
(1) As the oscillator is a high-frequency analog circuit, considerable care is required.
Cautions 1. The oscillator should be as close as possible to the X1 and X2 pins.
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
• A signal should not be taken from the oscillator.
stably, either. Also, if a high-precision oscillation frequency is required, consultation with the oscillator manufacturer
is recommended.
a ground pattern carrying a high current.
If oscillation is not performed normally and stably, the microcontroller will not be able to operate normally and
2. No other signal lines should pass through the area enclosed by the dotted line.
Figure 4-6 Cautions on Resonator Connection
CHAPTER 4 CLOCK GENERATOR
X2
PD784026
X1
V
SS
SS
pin. Do not ground to
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