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MSP430F149: 电压与频率,晶振的选择

Part Number: MSP430F149


根据手册,在使用2.0v时,最安全的是使用4Mhz。
但是当电压2.0v时,也可以使用硬件晶振8Mhz。
按目前配置会出现重大隐患吗?还是只要正常启动(起振)就没事了?
还是硬件可以使用8Mhz,软件进行分频到4Mhz就可以了?

还是我理解有问题,请指正一下。

  • 您好

    In LF mode, the LFXT1 oscillator requires a watch crystal. TI recommends a 5.1-MΩ resistor from XOUT to VSS when VCC < 2.5 V. In XT1 mode, the LFXT1 and XT2 oscillators accept a ceramic resonator or crystal up to 4.15 MHz at VCC ≥ 2.2 V. In XT1 mode, the LFXT1 and XT2 oscillators accept a ceramic resonator or crystal up to 8 MHz at VCC ≥ 2.8 V.

    首先根据datasheet显示,在如图测试条件下,您可以使用4Mhz和8Mhz。但是 In XT1 mode, the LFXT1 and XT2 oscillators accept a ceramic resonator or crystal up to 4.15 MHz at VCC ≥ 2.2 V. 在这个条件官方建议4.15Mhz,表中测试条件VCC=3.3V。不建议您在VCC=2.0V长时间保持8Mhz。In XT1 mode, the LFXT1 and XT2 oscillators accept a ceramic resonator or crystal up to 8 MHz at VCC ≥ 2.8 V.在这个条件最大可以达到8Mhz。

    2.2<vcc<2.5 官方建议您使用4Mhz  VCC ≥ 2.8 V 最大可以到达8Mhz。