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6 V8 J8 G8 }, e7 l- e9 C: U不確定是不是這個問題造成的，但可以參考一下這些資料。$ ~5 R' S4 N' U
f) r* {& X" j/ \) B下面這段話是肥死卡好（Freescale）的技術文檔節錄下來的，講得一針見血、但內容較雜（ 不只討論這個問題），我給你另一篇 ATMEL 的技術文檔，它專門討論 MCU 的 Start-up Time，淺顯易懂、還有一些電路上的建議！- P6 H% J8 t$ g8 v
, l* y/ Z$ m _% V2 b$ nLong Start-Up Time
/ B$ t& ?! m' e; {3 UA long start-up time is usually a more common problem with low-frequency crystals, since they tend to start much more slowly than high-frequency crystals. One of the causes of a long start-up time is weak loop gain. Oscillator start-up times will also be affected by the rise time of the power supply. When the power supply has a sharp rise time, the crystal will experience an energy impulse that will usually make it start faster than it would using a power supply with a slow rise time.
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发表于 2015-6-24 20:29
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发表于 2015-6-25 09:36
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发表于 2015-6-26 08:42
