void Init_ADC_seq(void)

{

P6SEL = 0x0F; // Enable A/D channel A0A1A2A3

ADC12CTL0 = ADC12ON+ADC12MSC+ADC12SHT0_8;

ADC12CTL1 = ADC12SHP+ADC12CONSEQ_1+ADC12SSEL1 ;    // Use sampling timer, single sequence // ADCCLK=MCLK,NO DIV ADC12CTL2 = ADC12RES_0; //8位的分辨率

 ADC12MCTL0 = ADC12INCH_0; // ref+=AVcc, channel = A0

ADC12MCTL1 = ADC12INCH_1; // ref+=AVcc, channel = A1

ADC12MCTL2 = ADC12INCH_2; // ref+=AVcc, channel = A2

ADC12MCTL3 = ADC12INCH_3+ADC12EOS; // ref+=AVcc, channel = A3, end seq.

 ADC12IE = 0x08; // Enable ADC12IFG.3

ADC12CTL0 |= ADC12ENC; // Enable conversions

}

可以跑32M，参考电压是AVCC 3.3V，AGND; 这配置，在我将ADC12转换分辨率设为12位时，是没有这现象的。