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MSP430F1232IPW 芯片做定时器内部时钟DCOCLK:内部数字可控晶振,具有可选择的频率 定时20mS,不同的片子差别 2mS



MSP430F1232IPW 芯片做定时器内部时钟DCOCLK 定时20mS,输出方波波形测试,不同的片子时间差别  2mS  。是什么原因??