3.22EjemploDRM007 Co..
3.22EjemploDRM007 Co..
3.22EjemploDRM007 Co..
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Hardware Design <strong>Co</strong>nsiderations<br />
Clock Source<br />
4.5 Clock Source<br />
The board uses a 4.00-MHz crystal (X1) connected to microcontroller’s<br />
oscillator inputs (OSC1 and OSC2). The MC68HC908MR8 uses its<br />
internal phase-locked loop (PLL) to multiply the input frequency in order<br />
to achieve its 8 MHz maximum operating frequency. See Figure 4-4.<br />
C13<br />
15pF<br />
X1<br />
4MHz<br />
R24<br />
10M<br />
2<br />
3<br />
OSC2<br />
OSC1<br />
MC68HC908MR8<br />
C14<br />
15pF<br />
IC9<br />
Figure 4-4. Clock Source<br />
BLDC Motor <strong>Co</strong>ntrol Board for Industrial and Appliance Applications<br />
DRM007<br />
MOTOROLA Hardware Design <strong>Co</strong>nsiderations 59
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