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R01DS0148EJ0102
Data Sheet
Chapter 4 Clock generators
4.3 Oscillator characteristics
4.3.1 Main oscillator
A ceramic or crystal resonator can be connected to the main clock input pins
as shown in figure 4-1 “Recommended Main Oscillator Circuit”
.
Figure 4-1 Recommended Main Oscillator Circuit
Caution Values of C
1
, C
2
and R
d
depend on the used ceramic or crystal resonator and
must be specified in cooperation with ceramic or crystal resonator
manufacturer.
(1) Main oscillator charactrisitics
Table 4-3 Main oscillator characteristics
Cautions 1. External clock input is prohibited.
2. General guidance for PCB layout:
• Keep the wiring length as short as possible.
• Do not cross the wiring with other signal lines.
• Do not route this circuit close to a signal line with high fluctuating current
flow.
• Always make the ground point of the oscillator capacitor the same
potential as REG0VSS and OSCVSS.
• Do not ground the capacitor to a ground pattern with high current flow.
• Do not tap signals from the oscillator.
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5G
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Parameter Symbol Condition Ratings Unit
MainOSC frequency fMOSC Crystal / Ceramic 4, 5, 6, 8, 10, 12, 16, 20 MHz
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