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| HD6473887 Datasheet, PDF (107/523 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer | |||
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2. Connecting a ceramic oscillator
Figure 4-4 shows a typical method of connecting a ceramic oscillator.
OSC 1
OSC 2
C1
Rf
C2
R f = 1 M⦠±20%
Oscillation
frequency Manufacturer
1.0 MHz Murata Seisakusho
4.0 MHz Murata Seisakusho
Recommended value
for C1 and C2
150 pF ±10%
30 pF ±10%
Figure 4-4 Typical Connection to Ceramic Oscillator
3. Notes on board design
When generating clock pulses by connecting a crystal or ceramic oscillator, 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
C1
OSC 1
OSC 2
C2
Figure 4-5 Board Design of Oscillator Circuit
90
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