HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 94

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

Connecting a Ceramic Oscillator: Figure 4.4 shows a typical method of connecting a ceramic
oscillator.
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 OSC
To be avoided
OSC
OSC
Figure 4.4 Typical Connection to Ceramic Oscillator
1
and OSC
Figure 4.5 Board Design of Oscillator Circuit
C
C
1
2
2
1
2
.
R
f
C
C
Signal A Signal B
1
2
R = 1 M
C = 30 pF 10%
C = 30 pF 10%
Ceramic oscillator: Murata
1
2
f
OSC
OSC
20%
1
2
85