H8SLASH300H datasheet(98/552 Pages) RENESAS

98 / 552 page

Section 4 Clock Pulse Generators

Rev. 3.00 May 15, 2007 Page 66 of 516

REJ09B0152-0300

4.2

System Clock Oscillator

Clock pulses can be supplied to the system clock divider either by connecting a crystal or ceramic

resonator, or by providing external clock input.

Either the system clock oscillator or on-chip oscillator can be selected, as shown in figure 4.1. For

the selecting method, see section 4.2.4, On-Chip Oscillator Selection Method.

4.2.1

Connecting Crystal Resonator

Figure 4.2 shows a typical method of connecting a crystal resonator. An AT-cut parallel-resonance

crystal resonator should be used. For notes on connecting, refer to section 4.5.2, Notes on Board

Design.

OSC1

OSC2

Frequency

Manufacturer

4.194304 MHz NIHON DEMPA KOGYO CO.,LTD.

C1, C2 Recommendation Value

Product Type

NR-18

12 pF ±20%

Figure 4.2 Typical Connection to Crystal Resonator

4.2.2

Connecting Ceramic Resonator

Figure 4.3 shows a typical method of connecting a ceramic resonator. For notes on connecting,

refer to section 4.5.2, Notes on Board Design.

OSC1

OSC2

Frequency

Manufacturer

4.19 MHz

Murata Manufacturing Co., Ltd.

C1, C2 Recommendation Value

15 pF (on-chip)

47 pF (on-chip)

Figure 4.3 Typical Connection to Ceramic Resonator

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