PPC34C60 datasheet(33/58 Pages) SMSC

Il numero della parte	PPC34C60

Spiegazioni elettronici	PARALLEL PORT INTERFACE CHIP PERIPHERAL SIDE

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Produttore elettronici	SMSC [SMSC Corporation]

Homepage	http://www.smsc.com

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33 / 58 page

SMSC DS – PPC34C60

Page 33

Rev. 06/01/2001

ADVANCED INFORMATION

SUGGESTED OSCILLATOR CIRCUITS

The PPC34C60 requires two frequency sources. The 24MHz clock is supplied with a parallel resonant 24MHz crystal

oscillator connected as shown in FIGURE 9. It is important that the board designer place the crystal oscillator close to the

PPC34C60 maintaining the shortest possible traces. The 24MHz clock is used by much of the internal circuitry and

provides the time base used by the Bus Interface circuitry.

The second clock source is provided by an RC circuit and should be connected as shown in FIGURE 10. This clock is

used primarily by the Watch Dog Timer and Piezo Driver functional blocks.

PPC34C60

Xin

Xout

24MHz Crystal

20 pF

FIGURE 9 - SUGGESTED 24 MHZ OSCILLATOR CIRCUIT

FIGURE 10 - SUGGESTED 32 KHZ OSCILLATOR CIRCUIT

PPC34C60

Yin

Yout

2.2 K

100

.068 uF

PPC34C60 Scheda tecnica(PDF) 33 Page - SMSC Corporation