stm32l单片机晶振的负载电容参数是强烈要求小于等于7pf的，规格书中原文如下：
To avoid exceeding the maximum value of CL1 and CL2 (15 pF) it is strongly recommended
to use a resonator with a load capacitance CL ≤ 7 pF. Never use a resonator with a load
capacitance of 12.5 pF.
Example: if the user chooses a resonator with a load capacitance of CL = 6 pF and Cstray =
2 pF, then CL1 = CL2 = 8 pF.
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To avoid exceeding the maximum value of CL1 and CL2 (15 pF) it is strongly recommended
to use a resonator with a load capacitance CL ≤ 7 pF. Never use a resonator with a load
capacitance of 12.5 pF.
Example: if the user chooses a resonator with a load capacitance of CL = 6 pF and Cstray =
2 pF, then CL1 = CL2 = 8 pF.
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