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寄存器需要重复清零才能成功

Other Parts Discussed in Thread: MSP430F169

msp430f169仿真时,ADC12CTL0 = 0x0232,在第一次清零ADC12CTL0 = 0x00后;ADC12CTL0的值为 0x0230;需要再次清零ADC12CTL0 = 0x00,ADC12CTL0的值才能真正清零。请问是什么原因呢?