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430内部DCO精度和VCC和温度相关,全温度全电压范围(-40--+85°)(1.8V--3.6V)情况下误差±5%。常温下约1%。
所以精度要求不高的情况下,可以使用430内部DCO
如果需要更高精度,可以用外部晶体作为时钟源。比如20ppm的crystal。