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f5529的XT2高频晶振范围是4到32M，手册上说6M，12M，20M，32M是用15pf，那4M ，8M晶振也用15pf么
负载电容大小一般是晶体厂家指定的，实际应用时，可以根据pcb走线等情况进行微调整。
如果6M，12M可以用15pf的话，那么8M晶振也用15pf也可以。
现在晶振可以用了，ACLK可以设置为XT2了
