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MSP430g2332 的usi配置成spi模式的问题

将其配置到spi模式时,在配置过程中,发现USIIFG默认情况下就是高电平,手册上说,当USIIFGCC为低电平时,写USICNT=8时,会自动清除这个标志位。实际单步调试时,发现并没有清除到这个标志位,请问这是为什么?