The ADC12IFGx bits are set when their corresponding ADC12MEMx memory
register is loaded with a conversion result. An interrupt request is generated
if the corresponding ADC12IEx bit and the GIE bit are set.
就是转换一次进一次中断。
如果想一个序列转换完了进一次中断
A sequence rolls over from ADC12MEM15 to ADC12MEM0 when the EOS bit in ADC12MCTL15 is not
set.
从这句话中看来到0通道就序列完成,所以响应0通道的中断,然后全部读取即可