在配置4线SPI时STE引脚功能需要配置成 P1SEL |=BIT4
P1SEL2 |=BIT4 吗？
下图没怎么看懂，配置UCMODE模式后，UCxSTE的输出状态怎么改变？？？是用P1OUT改变输出状态吗？（以P1.4为例）
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