请问我怎么样才能MSP430F169的AD采样参考电压设置为1.5V，我在程序中这样写:
P6SEL |= 0x20;
ADC12CTL0 = ADC12ON + SHT0_15 + MSC; // Turn on ADC12, set sampling time
ADC12CTL0 |= REFON;
ADC12CTL1 = SHP + CONSEQ_2; // Use sampling timer, set mode
ADC12MCTL0 |= 0x05;
ADC12IE = 0x01; // Enable ADC12IFG.0
ADC12CTL0 |= ENC; // Enable conversions
ADC12CTL0 |= ADC12SC; // Start conversion
DAC12_0CTL = DAC12IR + DAC12AMP_5 + DAC12ENC;
结果DA的参考电压是1.5V，但是AD的参考电压还是3.3V，请问我哪个寄存器配置错了？ |
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