在非NPI下，上电初始化UART没有调用UART_read(uartHandle, &isrRxBuf[0], UART_ISR_BUF_SIZE);这个函数功耗正常，当外部IO口电平触发调用这个函数后，通讯数据正常，想调用UART_close(uartHandle)这个函数把UART关掉，但功耗还是降不下去，为什么？
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