44B0X里面PLL锁定时间要求是大于150us还是208us

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 楼主| nfreebird 发表于 2008-5-5 23:50 | 显示全部楼层 |阅读模式
手册里面的两段描述:<br /><br /><br />PLL&nbsp;Lock&nbsp;Time<br />The&nbsp;lock&nbsp;time&nbsp;is&nbsp;the&nbsp;time&nbsp;required&nbsp;for&nbsp;PLL&nbsp;output&nbsp;stabilization.&nbsp;The&nbsp;lock&nbsp;time&nbsp;should&nbsp;be&nbsp;bigger&nbsp;than&nbsp;208us.&nbsp;After&nbsp;reset<br />and&nbsp;wake-up&nbsp;from&nbsp;STOP&nbsp;and&nbsp;SL_IDLE&nbsp;mode,&nbsp;respectively,&nbsp;the&nbsp;lock-time&nbsp;is&nbsp;inserted&nbsp;automatically&nbsp;by&nbsp;the&nbsp;internal<br />logic&nbsp;with&nbsp;lock&nbsp;time&nbsp;count&nbsp;register.&nbsp;The&nbsp;automatically&nbsp;inserted&nbsp;lock&nbsp;time&nbsp;is&nbsp;calculated&nbsp;as&nbsp;follows;<br /><br />PLL&nbsp;is&nbsp;turned&nbsp;on&nbsp;only&nbsp;when&nbsp;SLOW_BIT&nbsp;is&nbsp;1.<br />After&nbsp;PLL&nbsp;stabilization&nbsp;time&nbsp;(minimum&nbsp;150uS),&nbsp;SLOW_BIT<br />may&nbsp;be&nbsp;cleared&nbsp;to&nbsp;0.
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