System Clock Generator; Figure 4.2 Typical Connection To Crystal Oscillator; Figure 4.3 Typical Connection To Ceramic Oscillator - Renesas H8/3847R Series Hardware Manual

Section 4 Clock Pulse Generators
4.2

System Clock Generator

Clock pulses can be supplied to the system clock divider either by connecting a crystal or ceramic
oscillator, or by providing external clock input.
1. Connecting a Crystal Oscillator
Figure 4.2 shows a typical method of connecting a crystal oscillator. For information on
recommended resonators, see the product AC characteristics listed in section 15, Electrical
Characteristics. Please consult with the resonator manufacturer when selecting a resonator model.

Figure 4.2 Typical Connection to Crystal Oscillator

2. Connecting a Ceramic Oscillator
Figure 4.3 shows a typical method of connecting a ceramic oscillator. For information on
recommended resonators, see the product AC characteristics listed in section 15, Electrical
Characteristics. Please consult with the resonator manufacturer when selecting a resonator model.

Figure 4.3 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.
Rev. 6.00 Aug 04, 2006 page 120 of 680
REJ09B0145-0600
OSC
1
R
f
OSC
2
OSC
1
R
f
OSC
2
C
1
R = 1 MΩ ±20%
f
C
2
C
1
R = 1 MΩ ±20%
f
C
2