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MSP430F5336: XT1接口不加外围电路,外接32.768kHz晶体的负载电容选多少合适?

Part Number: MSP430F5336

现在用RS商城货号672-7603的12.5pF负载电容的晶体,XT1DRIVE寄存器设第3档,不是所有晶体都能起振,不起振概率大约1/20。选多大负载电容的晶体、寄存器设多少能保证起振?或者有合适的晶振产品推荐吗?要求±20ppm,-40~85℃或以上。