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| HD64F3644PV Datasheet, PDF (105/551 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents | |||
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Section 4 Clock Pulse Generators
Connecting a Ceramic Resonator: Figure 4.4 shows a typical method of connecting a ceramic
resonator.
OSC 1
OSC 2
C1
Rf
C2
R f = 1 M⦠±20%
C1 = 30 pF ±10%
C2 = 30 pF ±10%
Ceramic resonator: Murata
Figure 4.4 Typical Connection to Ceramic Resonator
Notes on Board Design: When generating clock pulses by connecting a crystal or ceramic
resonator, pay careful attention to the following points.
Avoid running signal lines close to the oscillator circuit, since the oscillator may be adversely
affected by induction currents. (See figure 4.5.)
The board should be designed so that the oscillator and load capacitors are located as close as
possible to pins OSC1 and OSC2.
To be avoided
Signal A Signal B
C2
OSC 1
OSC 2
C1
Figure 4.5 Board Design of Oscillator Circuit
Rev. 6.00 Sep 12, 2006 page 83 of 526
REJ09B0326-0600
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