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https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1342745/msp430fr5969-eusci-a-clock-and-enable-pin-usage-in-uart-mode
在 UART 模式中使用 USCA0时、P1.4 (UCA0STE/A4)和 P1.5 (UCA0CLK/A5)是否可用作模拟输入？
当然、只需正确设置引脚：
